peter dalgaard
2016-Sep-16 12:44 UTC
[R] stfrtime function not returning proper results through sqldf package in R
Presumably, sqldf does not know about Date object so passes an integer that gets interpreted as who knows what... This seems to work:> df <- data.frame(date=as.character(Sys.Date()+seq(0,180,,10))) > cbind(df, sqldf("select strftime( '%m', date) from df"))date strftime( '%m', date) 1 2016-09-16 09 2 2016-10-06 10 3 2016-10-26 10 4 2016-11-15 11 5 2016-12-05 12 6 2016-12-25 12 7 2017-01-14 01 8 2017-02-03 02 9 2017-02-23 02 10 2017-03-15 03 -pd On 16 Sep 2016, at 13:48 , PIKAL Petr <petr.pikal at precheza.cz> wrote:> Hi > > Most probably there is some syntactic suger how to correctly formulate sql query. > >> sqldf('select Date, strftime("Date", "%m") from log') > Date strftime("Date", "%m") > 1 2013-05-25 <NA> > 2 2013-05-28 <NA> > 3 2013-05-31 <NA> > 4 2013-06-01 <NA> > 5 2013-06-02 <NA> > 6 2013-06-05 <NA> > 7 2013-06-07 <NA> >> sqldf('select Date, format("Date", "%m") from log') > Error in sqliteSendQuery(con, statement, bind.data) : > error in statement: no such function: format >> > > format(sqldf("select Date from log"), "%m") > > This one however works. > > Cheers > Petr > > From: Manohar Reddy [mailto:manu.reddy52 at gmail.com] > Sent: Friday, September 16, 2016 11:55 AM > To: PIKAL Petr <petr.pikal at precheza.cz> > Cc: R-help <r-help at r-project.org> > Subject: Re: [R] stfrtime function not returning proper results through sqldf package in R > > > Hi Petr, > > Thanks, For me also it?s working fine when I directly used that function but when I call strftime function through sqldf package it?s returning NA values (PFA) ,but my requirement is I need to do that only sqldf as I?m writing some ?T sql ? queries against on the dataset. > > Manu. > > On Fri, Sep 16, 2016 at 12:56 PM, PIKAL Petr <petr.pikal at precheza.cz<mailto:petr.pikal at precheza.cz>> wrote: > Hi > > Hm >> format(log$Date, "%m") > [1] "05" "05" "05" "06" "06" "06" "06" >> strftime(log$Date, "%m") > [1] "05" "05" "05" "06" "06" "06" "06" >> > > works for me. > > Just a blind guess, is an object date somwhere in your environment? > > Cheers > Petr > > >> -----Original Message----- >> From: R-help [mailto:r-help-bounces at r-project.org<mailto:r-help-bounces at r-project.org>] On Behalf Of Manohar >> Reddy >> Sent: Friday, September 16, 2016 6:36 AM >> To: R-help <r-help at r-project.org<mailto:r-help at r-project.org>> >> Subject: [R] stfrtime function not returning proper results through sqldf >> package in R >> >> Hi , >> >> >> >> I have data something looks like below (or PFA), but when I?m extracting >> month using *strftime* function through *sqldf* library ,it?s returning >> below results but it?s not returning exact results ,it supposed to return >> 05,05,05,06,06,06.Can anyone please guide me how to do that with >> *strftime* function. >> >> >> >> Thanks in advance. >> >> >> >> Quiries : >> >> >> library(scales) >> >> # load data: >> log <- data.frame(Date >> c("2013/05/25","2013/05/28","2013/05/31","2013/06/01","2013/06/02","2013 >> /06/05","2013/06/07"), >> Quantity = c(9,1,15,4,5,17,18)) >> >> >> # convert date variable from factor to date format: >> log$Date <- as.Date(log$Date, >> "%Y/%m/%d") # tabulate all the options here >> str(log) >> >> >> >> >> >> >> >> Manu. > > ________________________________ > Tento e-mail a jak?koliv k n?mu p?ipojen? dokumenty jsou d?v?rn? a jsou ur?eny pouze jeho adres?t?m. > Jestli?e jste obdr?el(a) tento e-mail omylem, informujte laskav? neprodlen? jeho odes?latele. Obsah tohoto emailu i s p??lohami a jeho kopie vyma?te ze sv?ho syst?mu. > Nejste-li zam??len?m adres?tem tohoto emailu, nejste opr?vn?ni tento email jakkoliv u??vat, roz?i?ovat, kop?rovat ?i zve?ej?ovat. > Odes?latel e-mailu neodpov?d? za eventu?ln? ?kodu zp?sobenou modifikacemi ?i zpo?d?n?m p?enosu e-mailu. > > V p??pad?, ?e je tento e-mail sou??st? obchodn?ho jedn?n?: > - vyhrazuje si odes?latel pr?vo ukon?it kdykoliv jedn?n? o uzav?en? smlouvy, a to z jak?hokoliv d?vodu i bez uveden? d?vodu. > - a obsahuje-li nab?dku, je adres?t opr?vn?n nab?dku bezodkladn? p?ijmout; Odes?latel tohoto e-mailu (nab?dky) vylu?uje p?ijet? nab?dky ze strany p??jemce s dodatkem ?i odchylkou. > - trv? odes?latel na tom, ?e p??slu?n? smlouva je uzav?ena teprve v?slovn?m dosa?en?m shody na v?ech jej?ch n?le?itostech. > - odes?latel tohoto emailu informuje, ?e nen? opr?vn?n uzav?rat za spole?nost ??dn? smlouvy s v?jimkou p??pad?, kdy k tomu byl p?semn? zmocn?n nebo p?semn? pov??en a takov? pov??en? nebo pln? moc byly adres?tovi tohoto emailu p??padn? osob?, kterou adres?t zastupuje, p?edlo?eny nebo jejich existence je adres?tovi ?i osob? j?m zastoupen? zn?m?. > > This e-mail and any documents attached to it may be confidential and are intended only for its intended recipients. > If you received this e-mail by mistake, please immediately inform its sender. Delete the contents of this e-mail with all attachments and its copies from your system. > If you are not the intended recipient of this e-mail, you are not authorized to use, disseminate, copy or disclose this e-mail in any manner. > The sender of this e-mail shall not be liable for any possible damage caused by modifications of the e-mail or by delay with transfer of the email. > > In case that this e-mail forms part of business dealings: > - the sender reserves the right to end negotiations about entering into a contract in any time, for any reason, and without stating any reasoning. > - if the e-mail contains an offer, the recipient is entitled to immediately accept such offer; The sender of this e-mail (offer) excludes any acceptance of the offer on the part of the recipient containing any amendment or variation. > - the sender insists on that the respective contract is concluded only upon an express mutual agreement on all its aspects. > - the sender of this e-mail informs that he/she is not authorized to enter into any contracts on behalf of the company except for cases in which he/she is expressly authorized to do so in writing, and such authorization or power of attorney is submitted to the recipient or the person represented by the recipient, or the existence of such authorization is known to the recipient of the person represented by the recipient. > > > > -- > > > Thanks, > Manohar Reddy P > +91-9705302062. > > ________________________________ > Tento e-mail a jak?koliv k n?mu p?ipojen? dokumenty jsou d?v?rn? a jsou ur?eny pouze jeho adres?t?m. > Jestli?e jste obdr?el(a) tento e-mail omylem, informujte laskav? neprodlen? jeho odes?latele. Obsah tohoto emailu i s p??lohami a jeho kopie vyma?te ze sv?ho syst?mu. > Nejste-li zam??len?m adres?tem tohoto emailu, nejste opr?vn?ni tento email jakkoliv u??vat, roz?i?ovat, kop?rovat ?i zve?ej?ovat. > Odes?latel e-mailu neodpov?d? za eventu?ln? ?kodu zp?sobenou modifikacemi ?i zpo?d?n?m p?enosu e-mailu. > > V p??pad?, ?e je tento e-mail sou??st? obchodn?ho jedn?n?: > - vyhrazuje si odes?latel pr?vo ukon?it kdykoliv jedn?n? o uzav?en? smlouvy, a to z jak?hokoliv d?vodu i bez uveden? d?vodu. > - a obsahuje-li nab?dku, je adres?t opr?vn?n nab?dku bezodkladn? p?ijmout; Odes?latel tohoto e-mailu (nab?dky) vylu?uje p?ijet? nab?dky ze strany p??jemce s dodatkem ?i odchylkou. > - trv? odes?latel na tom, ?e p??slu?n? smlouva je uzav?ena teprve v?slovn?m dosa?en?m shody na v?ech jej?ch n?le?itostech. > - odes?latel tohoto emailu informuje, ?e nen? opr?vn?n uzav?rat za spole?nost ??dn? smlouvy s v?jimkou p??pad?, kdy k tomu byl p?semn? zmocn?n nebo p?semn? pov??en a takov? pov??en? nebo pln? moc byly adres?tovi tohoto emailu p??padn? osob?, kterou adres?t zastupuje, p?edlo?eny nebo jejich existence je adres?tovi ?i osob? j?m zastoupen? zn?m?. > > This e-mail and any documents attached to it may be confidential and are intended only for its intended recipients. > If you received this e-mail by mistake, please immediately inform its sender. Delete the contents of this e-mail with all attachments and its copies from your system. > If you are not the intended recipient of this e-mail, you are not authorized to use, disseminate, copy or disclose this e-mail in any manner. > The sender of this e-mail shall not be liable for any possible damage caused by modifications of the e-mail or by delay with transfer of the email. > > In case that this e-mail forms part of business dealings: > - the sender reserves the right to end negotiations about entering into a contract in any time, for any reason, and without stating any reasoning. > - if the e-mail contains an offer, the recipient is entitled to immediately accept such offer; The sender of this e-mail (offer) excludes any acceptance of the offer on the part of the recipient containing any amendment or variation. > - the sender insists on that the respective contract is concluded only upon an express mutual agreement on all its aspects. > - the sender of this e-mail informs that he/she is not authorized to enter into any contracts on behalf of the company except for cases in which he/she is expressly authorized to do so in writing, and such authorization or power of attorney is submitted to the recipient or the person represented by the recipient, or the existence of such authorization is known to the recipient of the person represented by the recipient. > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code.-- Peter Dalgaard, Professor, Center for Statistics, Copenhagen Business School Solbjerg Plads 3, 2000 Frederiksberg, Denmark Phone: (+45)38153501 Office: A 4.23 Email: pd.mes at cbs.dk Priv: PDalgd at gmail.com
PIKAL Petr
2016-Sep-16 13:23 UTC
[R] stfrtime function not returning proper results through sqldf package in R
Hi Peter
The devil is in detail
Data from OP had different format and was transferred to Date object by as.Date,
which results in incorrect values (and NA if not transferred)
df <- data.frame(Date =
c("2013/05/25","2013/05/28","2013/05/31","2013/06/01","2013/06/02",
"2013/06/05","2013/06/07"), Quantity = c(9,1,15,4,5,17,18))
df$Date<-as.Date(df$Date)
cbind(df, sqldf("select strftime( '%m', Date) from df"))
Data formatted according to your example transferred to Date object by as data,
again incorrect result
df2 <- data.frame(Date =
c("2013-05-25","2013-05-28","2013-05-31","2013-06-01","2013-06-02",
"2013-06-05","2013-06-07"), Quantity = c(9,1,15,4,5,17,18))
df2$Date<-as.Date(df2$Date)
cbind(df2, sqldf("select strftime( '%m', Date) from df2"))
Data formatted according to your example but **not** changed to Dates, correct
result
df3 <- data.frame(Date =
c("2013-05-25","2013-05-28","2013-05-31","2013-06-01","2013-06-02",
"2013-06-05","2013-06-07"), Quantity = c(9,1,15,4,5,17,18))
cbind(df3, sqldf("select strftime( '%m', Date) from df3"))
so sqldf is a bit peculiar about required input values and does not know how to
handle Date objects.
Cheers
Petr
> -----Original Message-----
> From: peter dalgaard [mailto:pdalgd at gmail.com]
> Sent: Friday, September 16, 2016 2:45 PM
> To: PIKAL Petr <petr.pikal at precheza.cz>
> Cc: Manohar Reddy <manu.reddy52 at gmail.com>; R-help <r-help at
r-
> project.org>
> Subject: Re: [R] stfrtime function not returning proper results through
sqldf
> package in R
>
> Presumably, sqldf does not know about Date object so passes an integer that
> gets interpreted as who knows what...
>
> This seems to work:
>
> > df <- data.frame(date=as.character(Sys.Date()+seq(0,180,,10)))
> > cbind(df, sqldf("select strftime( '%m', date) from
df"))
> date strftime( '%m', date)
> 1 2016-09-16 09
> 2 2016-10-06 10
> 3 2016-10-26 10
> 4 2016-11-15 11
> 5 2016-12-05 12
> 6 2016-12-25 12
> 7 2017-01-14 01
> 8 2017-02-03 02
> 9 2017-02-23 02
> 10 2017-03-15 03
>
> -pd
>
>
>
> On 16 Sep 2016, at 13:48 , PIKAL Petr <petr.pikal at precheza.cz>
wrote:
>
> > Hi
> >
> > Most probably there is some syntactic suger how to correctly formulate
sql
> query.
> >
> >> sqldf('select Date, strftime("Date", "%m")
from log')
> > Date strftime("Date", "%m")
> > 1 2013-05-25 <NA>
> > 2 2013-05-28 <NA>
> > 3 2013-05-31 <NA>
> > 4 2013-06-01 <NA>
> > 5 2013-06-02 <NA>
> > 6 2013-06-05 <NA>
> > 7 2013-06-07 <NA>
> >> sqldf('select Date, format("Date", "%m")
from log')
> > Error in sqliteSendQuery(con, statement, bind.data) :
> > error in statement: no such function: format
> >>
> >
> > format(sqldf("select Date from log"), "%m")
> >
> > This one however works.
> >
> > Cheers
> > Petr
> >
> > From: Manohar Reddy [mailto:manu.reddy52 at gmail.com]
> > Sent: Friday, September 16, 2016 11:55 AM
> > To: PIKAL Petr <petr.pikal at precheza.cz>
> > Cc: R-help <r-help at r-project.org>
> > Subject: Re: [R] stfrtime function not returning proper results
> > through sqldf package in R
> >
> >
> > Hi Petr,
> >
> > Thanks, For me also it?s working fine when I directly used that
function but
> when I call strftime function through sqldf package it?s returning NA
values
> (PFA) ,but my requirement is I need to do that only sqldf as I?m writing
some
> ?T sql ? queries against on the dataset.
> >
> > Manu.
> >
> > On Fri, Sep 16, 2016 at 12:56 PM, PIKAL Petr
> <petr.pikal at precheza.cz<mailto:petr.pikal at precheza.cz>>
wrote:
> > Hi
> >
> > Hm
> >> format(log$Date, "%m")
> > [1] "05" "05" "05" "06"
"06" "06" "06"
> >> strftime(log$Date, "%m")
> > [1] "05" "05" "05" "06"
"06" "06" "06"
> >>
> >
> > works for me.
> >
> > Just a blind guess, is an object date somwhere in your environment?
> >
> > Cheers
> > Petr
> >
> >
> >> -----Original Message-----
> >> From: R-help
> >> [mailto:r-help-bounces at r-project.org<mailto:r-help-bounces
at r-project.
> >> org>] On Behalf Of Manohar Reddy
> >> Sent: Friday, September 16, 2016 6:36 AM
> >> To: R-help <r-help at r-project.org<mailto:r-help at
r-project.org>>
> >> Subject: [R] stfrtime function not returning proper results
through
> >> sqldf package in R
> >>
> >> Hi ,
> >>
> >>
> >>
> >> I have data something looks like below (or PFA), but when I?m
> >> extracting month using *strftime* function through *sqldf*
library
> >> ,it?s returning below results but it?s not returning exact results
> >> ,it supposed to return 05,05,05,06,06,06.Can anyone please guide
me
> >> how to do that with
> >> *strftime* function.
> >>
> >>
> >>
> >> Thanks in advance.
> >>
> >>
> >>
> >> Quiries :
> >>
> >>
> >> library(scales)
> >>
> >> # load data:
> >> log <- data.frame(Date > >>
c("2013/05/25","2013/05/28","2013/05/31","2013/06/01","2013/06/02","2
> >> 013
> >> /06/05","2013/06/07"),
> >> Quantity = c(9,1,15,4,5,17,18))
> >>
> >>
> >> # convert date variable from factor to date format:
> >> log$Date <- as.Date(log$Date,
> >> "%Y/%m/%d") # tabulate all the options here
> >> str(log)
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >> Manu.
> >
> > ________________________________
> > Tento e-mail a jak?koliv k n?mu p?ipojen? dokumenty jsou d?v?rn? a
jsou
> ur?eny pouze jeho adres?t?m.
> > Jestli?e jste obdr?el(a) tento e-mail omylem, informujte laskav?
> neprodlen? jeho odes?latele. Obsah tohoto emailu i s p??lohami a jeho kopie
> vyma?te ze sv?ho syst?mu.
> > Nejste-li zam??len?m adres?tem tohoto emailu, nejste opr?vn?ni tento
> email jakkoliv u??vat, roz?i?ovat, kop?rovat ?i zve?ej?ovat.
> > Odes?latel e-mailu neodpov?d? za eventu?ln? ?kodu zp?sobenou
> modifikacemi ?i zpo?d?n?m p?enosu e-mailu.
> >
> > V p??pad?, ?e je tento e-mail sou??st? obchodn?ho jedn?n?:
> > - vyhrazuje si odes?latel pr?vo ukon?it kdykoliv jedn?n? o uzav?en?
smlouvy,
> a to z jak?hokoliv d?vodu i bez uveden? d?vodu.
> > - a obsahuje-li nab?dku, je adres?t opr?vn?n nab?dku bezodkladn?
> p?ijmout; Odes?latel tohoto e-mailu (nab?dky) vylu?uje p?ijet? nab?dky ze
> strany p??jemce s dodatkem ?i odchylkou.
> > - trv? odes?latel na tom, ?e p??slu?n? smlouva je uzav?ena teprve
v?slovn?m
> dosa?en?m shody na v?ech jej?ch n?le?itostech.
> > - odes?latel tohoto emailu informuje, ?e nen? opr?vn?n uzav?rat za
> spole?nost ??dn? smlouvy s v?jimkou p??pad?, kdy k tomu byl p?semn?
> zmocn?n nebo p?semn? pov??en a takov? pov??en? nebo pln? moc byly
> adres?tovi tohoto emailu p??padn? osob?, kterou adres?t zastupuje,
> p?edlo?eny nebo jejich existence je adres?tovi ?i osob? j?m zastoupen?
> zn?m?.
> >
> > This e-mail and any documents attached to it may be confidential and
are
> intended only for its intended recipients.
> > If you received this e-mail by mistake, please immediately inform its
> sender. Delete the contents of this e-mail with all attachments and its
copies
> from your system.
> > If you are not the intended recipient of this e-mail, you are not
authorized
> to use, disseminate, copy or disclose this e-mail in any manner.
> > The sender of this e-mail shall not be liable for any possible damage
caused
> by modifications of the e-mail or by delay with transfer of the email.
> >
> > In case that this e-mail forms part of business dealings:
> > - the sender reserves the right to end negotiations about entering
into a
> contract in any time, for any reason, and without stating any reasoning.
> > - if the e-mail contains an offer, the recipient is entitled to
immediately
> accept such offer; The sender of this e-mail (offer) excludes any
acceptance
> of the offer on the part of the recipient containing any amendment or
> variation.
> > - the sender insists on that the respective contract is concluded only
upon
> an express mutual agreement on all its aspects.
> > - the sender of this e-mail informs that he/she is not authorized to
enter
> into any contracts on behalf of the company except for cases in which
he/she
> is expressly authorized to do so in writing, and such authorization or
power of
> attorney is submitted to the recipient or the person represented by the
> recipient, or the existence of such authorization is known to the recipient
of
> the person represented by the recipient.
> >
> >
> >
> > --
> >
> >
> > Thanks,
> > Manohar Reddy P
> > +91-9705302062.
> >
> > ________________________________
> > Tento e-mail a jak?koliv k n?mu p?ipojen? dokumenty jsou d?v?rn? a
jsou
> ur?eny pouze jeho adres?t?m.
> > Jestli?e jste obdr?el(a) tento e-mail omylem, informujte laskav?
> neprodlen? jeho odes?latele. Obsah tohoto emailu i s p??lohami a jeho kopie
> vyma?te ze sv?ho syst?mu.
> > Nejste-li zam??len?m adres?tem tohoto emailu, nejste opr?vn?ni tento
> email jakkoliv u??vat, roz?i?ovat, kop?rovat ?i zve?ej?ovat.
> > Odes?latel e-mailu neodpov?d? za eventu?ln? ?kodu zp?sobenou
> modifikacemi ?i zpo?d?n?m p?enosu e-mailu.
> >
> > V p??pad?, ?e je tento e-mail sou??st? obchodn?ho jedn?n?:
> > - vyhrazuje si odes?latel pr?vo ukon?it kdykoliv jedn?n? o uzav?en?
smlouvy,
> a to z jak?hokoliv d?vodu i bez uveden? d?vodu.
> > - a obsahuje-li nab?dku, je adres?t opr?vn?n nab?dku bezodkladn?
> p?ijmout; Odes?latel tohoto e-mailu (nab?dky) vylu?uje p?ijet? nab?dky ze
> strany p??jemce s dodatkem ?i odchylkou.
> > - trv? odes?latel na tom, ?e p??slu?n? smlouva je uzav?ena teprve
v?slovn?m
> dosa?en?m shody na v?ech jej?ch n?le?itostech.
> > - odes?latel tohoto emailu informuje, ?e nen? opr?vn?n uzav?rat za
> spole?nost ??dn? smlouvy s v?jimkou p??pad?, kdy k tomu byl p?semn?
> zmocn?n nebo p?semn? pov??en a takov? pov??en? nebo pln? moc byly
> adres?tovi tohoto emailu p??padn? osob?, kterou adres?t zastupuje,
> p?edlo?eny nebo jejich existence je adres?tovi ?i osob? j?m zastoupen?
> zn?m?.
> >
> > This e-mail and any documents attached to it may be confidential and
are
> intended only for its intended recipients.
> > If you received this e-mail by mistake, please immediately inform its
> sender. Delete the contents of this e-mail with all attachments and its
copies
> from your system.
> > If you are not the intended recipient of this e-mail, you are not
authorized
> to use, disseminate, copy or disclose this e-mail in any manner.
> > The sender of this e-mail shall not be liable for any possible damage
caused
> by modifications of the e-mail or by delay with transfer of the email.
> >
> > In case that this e-mail forms part of business dealings:
> > - the sender reserves the right to end negotiations about entering
into a
> contract in any time, for any reason, and without stating any reasoning.
> > - if the e-mail contains an offer, the recipient is entitled to
immediately
> accept such offer; The sender of this e-mail (offer) excludes any
acceptance
> of the offer on the part of the recipient containing any amendment or
> variation.
> > - the sender insists on that the respective contract is concluded only
upon
> an express mutual agreement on all its aspects.
> > - the sender of this e-mail informs that he/she is not authorized to
enter
> into any contracts on behalf of the company except for cases in which
he/she
> is expressly authorized to do so in writing, and such authorization or
power of
> attorney is submitted to the recipient or the person represented by the
> recipient, or the existence of such authorization is known to the recipient
of
> the person represented by the recipient.
> >
> > [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide
> > http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
>
> --
> Peter Dalgaard, Professor,
> Center for Statistics, Copenhagen Business School Solbjerg Plads 3, 2000
> Frederiksberg, Denmark
> Phone: (+45)38153501
> Office: A 4.23
> Email: pd.mes at cbs.dk Priv: PDalgd at gmail.com
________________________________
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Jeff Newmiller
2016-Sep-16 14:15 UTC
[R] stfrtime function not returning proper results through sqldf package in R
SQLite only understands certain fundamental data types, and neither Date nor POSIXct types are among them. They get stored as their internal numeric representations. The internal numeric representations of Date and POSIXct are incompatible. You are sending Dates to SQLite and trying to then interpret it as POSIXct by handing that numeric to strftime. Note that within R the Date and POSIXct types are made sort-of compatible by internal checking of class attributes that are not stored in SQLite. They are still only sort-of compatible because Date has no concept of time zone and always assumes GMT rather than local time when being converted. I recommend retrieving the stored Date value as a Date value into R so that strftime can recognize how to interpret it. If you need to handle time as well as date you may find that converting to character first before converting to POSIXct with an appropriate time zone behaves with least surprises. -- Sent from my phone. Please excuse my brevity. On September 16, 2016 6:23:48 AM PDT, PIKAL Petr <petr.pikal at precheza.cz> wrote:>Hi Peter > >The devil is in detail > >Data from OP had different format and was transferred to Date object by >as.Date, which results in incorrect values (and NA if not transferred) >df <- data.frame(Date >c("2013/05/25","2013/05/28","2013/05/31","2013/06/01","2013/06/02", >"2013/06/05","2013/06/07"), Quantity = c(9,1,15,4,5,17,18)) >df$Date<-as.Date(df$Date) >cbind(df, sqldf("select strftime( '%m', Date) from df")) > >Data formatted according to your example transferred to Date object by >as data, again incorrect result >df2 <- data.frame(Date >c("2013-05-25","2013-05-28","2013-05-31","2013-06-01","2013-06-02", >"2013-06-05","2013-06-07"), Quantity = c(9,1,15,4,5,17,18)) >df2$Date<-as.Date(df2$Date) >cbind(df2, sqldf("select strftime( '%m', Date) from df2")) > >Data formatted according to your example but **not** changed to Dates, >correct result >df3 <- data.frame(Date >c("2013-05-25","2013-05-28","2013-05-31","2013-06-01","2013-06-02", >"2013-06-05","2013-06-07"), Quantity = c(9,1,15,4,5,17,18)) >cbind(df3, sqldf("select strftime( '%m', Date) from df3")) > >so sqldf is a bit peculiar about required input values and does not >know how to handle Date objects. > >Cheers >Petr > > >> -----Original Message----- >> From: peter dalgaard [mailto:pdalgd at gmail.com] >> Sent: Friday, September 16, 2016 2:45 PM >> To: PIKAL Petr <petr.pikal at precheza.cz> >> Cc: Manohar Reddy <manu.reddy52 at gmail.com>; R-help <r-help at r- >> project.org> >> Subject: Re: [R] stfrtime function not returning proper results >through sqldf >> package in R >> >> Presumably, sqldf does not know about Date object so passes an >integer that >> gets interpreted as who knows what... >> >> This seems to work: >> >> > df <- data.frame(date=as.character(Sys.Date()+seq(0,180,,10))) >> > cbind(df, sqldf("select strftime( '%m', date) from df")) >> date strftime( '%m', date) >> 1 2016-09-16 09 >> 2 2016-10-06 10 >> 3 2016-10-26 10 >> 4 2016-11-15 11 >> 5 2016-12-05 12 >> 6 2016-12-25 12 >> 7 2017-01-14 01 >> 8 2017-02-03 02 >> 9 2017-02-23 02 >> 10 2017-03-15 03 >> >> -pd >> >> >> >> On 16 Sep 2016, at 13:48 , PIKAL Petr <petr.pikal at precheza.cz> wrote: >> >> > Hi >> > >> > Most probably there is some syntactic suger how to correctly >formulate sql >> query. >> > >> >> sqldf('select Date, strftime("Date", "%m") from log') >> > Date strftime("Date", "%m") >> > 1 2013-05-25 <NA> >> > 2 2013-05-28 <NA> >> > 3 2013-05-31 <NA> >> > 4 2013-06-01 <NA> >> > 5 2013-06-02 <NA> >> > 6 2013-06-05 <NA> >> > 7 2013-06-07 <NA> >> >> sqldf('select Date, format("Date", "%m") from log') >> > Error in sqliteSendQuery(con, statement, bind.data) : >> > error in statement: no such function: format >> >> >> > >> > format(sqldf("select Date from log"), "%m") >> > >> > This one however works. >> > >> > Cheers >> > Petr >> > >> > From: Manohar Reddy [mailto:manu.reddy52 at gmail.com] >> > Sent: Friday, September 16, 2016 11:55 AM >> > To: PIKAL Petr <petr.pikal at precheza.cz> >> > Cc: R-help <r-help at r-project.org> >> > Subject: Re: [R] stfrtime function not returning proper results >> > through sqldf package in R >> > >> > >> > Hi Petr, >> > >> > Thanks, For me also it?s working fine when I directly used that >function but >> when I call strftime function through sqldf package it?s returning NA >values >> (PFA) ,but my requirement is I need to do that only sqldf as I?m >writing some >> ?T sql ? queries against on the dataset. >> > >> > Manu. >> > >> > On Fri, Sep 16, 2016 at 12:56 PM, PIKAL Petr >> <petr.pikal at precheza.cz<mailto:petr.pikal at precheza.cz>> wrote: >> > Hi >> > >> > Hm >> >> format(log$Date, "%m") >> > [1] "05" "05" "05" "06" "06" "06" "06" >> >> strftime(log$Date, "%m") >> > [1] "05" "05" "05" "06" "06" "06" "06" >> >> >> > >> > works for me. >> > >> > Just a blind guess, is an object date somwhere in your environment? >> > >> > Cheers >> > Petr >> > >> > >> >> -----Original Message----- >> >> From: R-help >> >> >[mailto:r-help-bounces at r-project.org<mailto:r-help-bounces at r-project. >> >> org>] On Behalf Of Manohar Reddy >> >> Sent: Friday, September 16, 2016 6:36 AM >> >> To: R-help <r-help at r-project.org<mailto:r-help at r-project.org>> >> >> Subject: [R] stfrtime function not returning proper results >through >> >> sqldf package in R >> >> >> >> Hi , >> >> >> >> >> >> >> >> I have data something looks like below (or PFA), but when I?m >> >> extracting month using *strftime* function through *sqldf* >library >> >> ,it?s returning below results but it?s not returning exact results >> >> ,it supposed to return 05,05,05,06,06,06.Can anyone please guide >me >> >> how to do that with >> >> *strftime* function. >> >> >> >> >> >> >> >> Thanks in advance. >> >> >> >> >> >> >> >> Quiries : >> >> >> >> >> >> library(scales) >> >> >> >> # load data: >> >> log <- data.frame(Date >> >> >c("2013/05/25","2013/05/28","2013/05/31","2013/06/01","2013/06/02","2 >> >> 013 >> >> /06/05","2013/06/07"), >> >> Quantity = c(9,1,15,4,5,17,18)) >> >> >> >> >> >> # convert date variable from factor to date format: >> >> log$Date <- as.Date(log$Date, >> >> "%Y/%m/%d") # tabulate all the options here >> >> str(log) >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> Manu. >> > >> > ________________________________ >> > Tento e-mail a jak?koliv k n?mu p?ipojen? dokumenty jsou d?v?rn? a >jsou >> ur?eny pouze jeho adres?t?m. >> > Jestli?e jste obdr?el(a) tento e-mail omylem, informujte laskav? >> neprodlen? jeho odes?latele. Obsah tohoto emailu i s p??lohami a jeho >kopie >> vyma?te ze sv?ho syst?mu. >> > Nejste-li zam??len?m adres?tem tohoto emailu, nejste opr?vn?ni >tento >> email jakkoliv u??vat, roz?i?ovat, kop?rovat ?i zve?ej?ovat. >> > Odes?latel e-mailu neodpov?d? za eventu?ln? ?kodu zp?sobenou >> modifikacemi ?i zpo?d?n?m p?enosu e-mailu. >> > >> > V p??pad?, ?e je tento e-mail sou??st? obchodn?ho jedn?n?: >> > - vyhrazuje si odes?latel pr?vo ukon?it kdykoliv jedn?n? o uzav?en? >smlouvy, >> a to z jak?hokoliv d?vodu i bez uveden? d?vodu. >> > - a obsahuje-li nab?dku, je adres?t opr?vn?n nab?dku bezodkladn? >> p?ijmout; Odes?latel tohoto e-mailu (nab?dky) vylu?uje p?ijet? >nab?dky ze >> strany p??jemce s dodatkem ?i odchylkou. >> > - trv? odes?latel na tom, ?e p??slu?n? smlouva je uzav?ena teprve >v?slovn?m >> dosa?en?m shody na v?ech jej?ch n?le?itostech. >> > - odes?latel tohoto emailu informuje, ?e nen? opr?vn?n uzav?rat za >> spole?nost ??dn? smlouvy s v?jimkou p??pad?, kdy k tomu byl p?semn? >> zmocn?n nebo p?semn? pov??en a takov? pov??en? nebo pln? moc byly >> adres?tovi tohoto emailu p??padn? osob?, kterou adres?t zastupuje, >> p?edlo?eny nebo jejich existence je adres?tovi ?i osob? j?m >zastoupen? >> zn?m?. >> > >> > This e-mail and any documents attached to it may be confidential >and are >> intended only for its intended recipients. >> > If you received this e-mail by mistake, please immediately inform >its >> sender. Delete the contents of this e-mail with all attachments and >its copies >> from your system. >> > If you are not the intended recipient of this e-mail, you are not >authorized >> to use, disseminate, copy or disclose this e-mail in any manner. >> > The sender of this e-mail shall not be liable for any possible >damage caused >> by modifications of the e-mail or by delay with transfer of the >email. >> > >> > In case that this e-mail forms part of business dealings: >> > - the sender reserves the right to end negotiations about entering >into a >> contract in any time, for any reason, and without stating any >reasoning. >> > - if the e-mail contains an offer, the recipient is entitled to >immediately >> accept such offer; The sender of this e-mail (offer) excludes any >acceptance >> of the offer on the part of the recipient containing any amendment or >> variation. >> > - the sender insists on that the respective contract is concluded >only upon >> an express mutual agreement on all its aspects. >> > - the sender of this e-mail informs that he/she is not authorized >to enter >> into any contracts on behalf of the company except for cases in which >he/she >> is expressly authorized to do so in writing, and such authorization >or power of >> attorney is submitted to the recipient or the person represented by >the >> recipient, or the existence of such authorization is known to the >recipient of >> the person represented by the recipient. >> > >> > >> > >> > -- >> > >> > >> > Thanks, >> > Manohar Reddy P >> > +91-9705302062. >> > >> > ________________________________ >> > Tento e-mail a jak?koliv k n?mu p?ipojen? dokumenty jsou d?v?rn? a >jsou >> ur?eny pouze jeho adres?t?m. >> > Jestli?e jste obdr?el(a) tento e-mail omylem, informujte laskav? >> neprodlen? jeho odes?latele. Obsah tohoto emailu i s p??lohami a jeho >kopie >> vyma?te ze sv?ho syst?mu. >> > Nejste-li zam??len?m adres?tem tohoto emailu, nejste opr?vn?ni >tento >> email jakkoliv u??vat, roz?i?ovat, kop?rovat ?i zve?ej?ovat. >> > Odes?latel e-mailu neodpov?d? za eventu?ln? ?kodu zp?sobenou >> modifikacemi ?i zpo?d?n?m p?enosu e-mailu. >> > >> > V p??pad?, ?e je tento e-mail sou??st? obchodn?ho jedn?n?: >> > - vyhrazuje si odes?latel pr?vo ukon?it kdykoliv jedn?n? o uzav?en? >smlouvy, >> a to z jak?hokoliv d?vodu i bez uveden? d?vodu. >> > - a obsahuje-li nab?dku, je adres?t opr?vn?n nab?dku bezodkladn? >> p?ijmout; Odes?latel tohoto e-mailu (nab?dky) vylu?uje p?ijet? >nab?dky ze >> strany p??jemce s dodatkem ?i odchylkou. >> > - trv? odes?latel na tom, ?e p??slu?n? smlouva je uzav?ena teprve >v?slovn?m >> dosa?en?m shody na v?ech jej?ch n?le?itostech. >> > - odes?latel tohoto emailu informuje, ?e nen? opr?vn?n uzav?rat za >> spole?nost ??dn? smlouvy s v?jimkou p??pad?, kdy k tomu byl p?semn? >> zmocn?n nebo p?semn? pov??en a takov? pov??en? nebo pln? moc byly >> adres?tovi tohoto emailu p??padn? osob?, kterou adres?t zastupuje, >> p?edlo?eny nebo jejich existence je adres?tovi ?i osob? j?m >zastoupen? >> zn?m?. >> > >> > This e-mail and any documents attached to it may be confidential >and are >> intended only for its intended recipients. >> > If you received this e-mail by mistake, please immediately inform >its >> sender. Delete the contents of this e-mail with all attachments and >its copies >> from your system. >> > If you are not the intended recipient of this e-mail, you are not >authorized >> to use, disseminate, copy or disclose this e-mail in any manner. >> > The sender of this e-mail shall not be liable for any possible >damage caused >> by modifications of the e-mail or by delay with transfer of the >email. >> > >> > In case that this e-mail forms part of business dealings: >> > - the sender reserves the right to end negotiations about entering >into a >> contract in any time, for any reason, and without stating any >reasoning. >> > - if the e-mail contains an offer, the recipient is entitled to >immediately >> accept such offer; The sender of this e-mail (offer) excludes any >acceptance >> of the offer on the part of the recipient containing any amendment or >> variation. >> > - the sender insists on that the respective contract is concluded >only upon >> an express mutual agreement on all its aspects. >> > - the sender of this e-mail informs that he/she is not authorized >to enter >> into any contracts on behalf of the company except for cases in which >he/she >> is expressly authorized to do so in writing, and such authorization >or power of >> attorney is submitted to the recipient or the person represented by >the >> recipient, or the existence of such authorization is known to the >recipient of >> the person represented by the recipient. >> > >> > [[alternative HTML version deleted]] >> > >> > ______________________________________________ >> > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see >> > https://stat.ethz.ch/mailman/listinfo/r-help >> > PLEASE do read the posting guide >> > http://www.R-project.org/posting-guide.html >> > and provide commented, minimal, self-contained, reproducible code. >> >> -- >> Peter Dalgaard, Professor, >> Center for Statistics, Copenhagen Business School Solbjerg Plads 3, >2000 >> Frederiksberg, Denmark >> Phone: (+45)38153501 >> Office: A 4.23 >> Email: pd.mes at cbs.dk Priv: PDalgd at gmail.com > > >________________________________ >Tento e-mail a jak?koliv k n?mu p?ipojen? dokumenty jsou d?v?rn? a jsou >ur?eny pouze jeho adres?t?m. >Jestli?e jste obdr?el(a) tento e-mail omylem, informujte laskav? >neprodlen? jeho odes?latele. Obsah tohoto emailu i s p??lohami a jeho >kopie vyma?te ze sv?ho syst?mu. >Nejste-li zam??len?m adres?tem tohoto emailu, nejste opr?vn?ni tento >email jakkoliv u??vat, roz?i?ovat, kop?rovat ?i zve?ej?ovat. >Odes?latel e-mailu neodpov?d? za eventu?ln? ?kodu zp?sobenou >modifikacemi ?i zpo?d?n?m p?enosu e-mailu. > >V p??pad?, ?e je tento e-mail sou??st? obchodn?ho jedn?n?: >- vyhrazuje si odes?latel pr?vo ukon?it kdykoliv jedn?n? o uzav?en? >smlouvy, a to z jak?hokoliv d?vodu i bez uveden? d?vodu. >- a obsahuje-li nab?dku, je adres?t opr?vn?n nab?dku bezodkladn? >p?ijmout; Odes?latel tohoto e-mailu (nab?dky) vylu?uje p?ijet? nab?dky >ze strany p??jemce s dodatkem ?i odchylkou. >- trv? odes?latel na tom, ?e p??slu?n? smlouva je uzav?ena teprve >v?slovn?m dosa?en?m shody na v?ech jej?ch n?le?itostech. >- odes?latel tohoto emailu informuje, ?e nen? opr?vn?n uzav?rat za >spole?nost ??dn? smlouvy s v?jimkou p??pad?, kdy k tomu byl p?semn? >zmocn?n nebo p?semn? pov??en a takov? pov??en? nebo pln? moc byly >adres?tovi tohoto emailu p??padn? osob?, kterou adres?t zastupuje, >p?edlo?eny nebo jejich existence je adres?tovi ?i osob? j?m zastoupen? >zn?m?. > >This e-mail and any documents attached to it may be confidential and >are intended only for its intended recipients. >If you received this e-mail by mistake, please immediately inform its >sender. Delete the contents of this e-mail with all attachments and its >copies from your system. >If you are not the intended recipient of this e-mail, you are not >authorized to use, disseminate, copy or disclose this e-mail in any >manner. >The sender of this e-mail shall not be liable for any possible damage >caused by modifications of the e-mail or by delay with transfer of the >email. > >In case that this e-mail forms part of business dealings: >- the sender reserves the right to end negotiations about entering into >a contract in any time, for any reason, and without stating any >reasoning. >- if the e-mail contains an offer, the recipient is entitled to >immediately accept such offer; The sender of this e-mail (offer) >excludes any acceptance of the offer on the part of the recipient >containing any amendment or variation. >- the sender insists on that the respective contract is concluded only >upon an express mutual agreement on all its aspects. >- the sender of this e-mail informs that he/she is not authorized to >enter into any contracts on behalf of the company except for cases in >which he/she is expressly authorized to do so in writing, and such >authorization or power of attorney is submitted to the recipient or the >person represented by the recipient, or the existence of such >authorization is known to the recipient of the person represented by >the recipient. >______________________________________________ >R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see >https://stat.ethz.ch/mailman/listinfo/r-help >PLEASE do read the posting guide >http://www.R-project.org/posting-guide.html >and provide commented, minimal, self-contained, reproducible code.
peter dalgaard
2016-Sep-16 15:38 UTC
[R] stfrtime function not returning proper results through sqldf package in R
On 16 Sep 2016, at 15:23 , PIKAL Petr <petr.pikal at precheza.cz> wrote:> Hi Peter > > The devil is in detail > > Data from OP had different format and was transferred to Date object by as.Date, which results in incorrect values (and NA if not transferred) > df <- data.frame(Date = c("2013/05/25","2013/05/28","2013/05/31","2013/06/01","2013/06/02", > "2013/06/05","2013/06/07"), Quantity = c(9,1,15,4,5,17,18)) > df$Date<-as.Date(df$Date) > cbind(df, sqldf("select strftime( '%m', Date) from df")) >To be fair, he actually used as.Date(...., "%Y/%m/%d"), so the values were in fact correct. The issue lay in the conversion to integer. I can't figure out how those integers are interpreted, though:> df <- data.frame(date=c(0,1000,2000)) > cbind(df, sqldf("select strftime( '%Y-%m-%d', date) from df"))date strftime( '%Y-%m-%d', date) 1 0 -471-11-24 2 1000 -471-08-20 3 2000 -470-05-16 so the Epoch is nothing sensible and negative years are more than a thousand days?? -- Peter Dalgaard, Professor, Center for Statistics, Copenhagen Business School Solbjerg Plads 3, 2000 Frederiksberg, Denmark Phone: (+45)38153501 Office: A 4.23 Email: pd.mes at cbs.dk Priv: PDalgd at gmail.com