Dear Jeff and Bert,
Thank you very much for your correction and explanation.
And yes, I need to study about date format more.
Sorry for HTML mail, don't realize.
I was able to subset the data that I want.
mjo30<-read.table("rmm.txt", header=FALSE, skip=4234, nrows=10957)
mjo30$V8<-NULL
names(mjo30)<-c("year","month","day",
"rmm1","rmm2","phase","amp")
mjo3<-as.Date(with(mjo30,paste(year,month, day,
sep="-")),"%Y-%m-%d")
mjo<-mjo30[which(mjo3%in%date),]
head(mjo)
year month day rmm1 rmm2 phase amp
115 1986 4 25 -0.319090 -0.363030 2 0.483332
526 1987 6 10 1.662870 0.291632 5 1.688250
977 1988 9 3 -0.604950 -0.299850 1 0.675181
1374 1989 10 5 0.972298 -0.461030 4 1.076060
1760 1990 10 26 -1.183110 -1.589810 2 1.981730
1953 1991 5 7 -0.317180 0.953061 7 1.004450
Best,
Ani
On Tue, Jan 14, 2020 at 3:20 PM Jeff Newmiller <jdnewmil at
dcn.davis.ca.us> wrote:>
> The dput function is for re-creating an R object in another R workspace, so
it uses fundamental base types to define objects. A Date is really the number of
days since a specific date (typically 1970-01-01) that get converted to look
like dates whenever you display or print them, so what you are seiing are those
numbers. If we enter the R code returned by dput into our R session we will be
able to see the dates.
>
> Your mjo30 table seems to call the day of the month the "date"...
which is confusing. I would combine those three columns into one like
>
> mjo30$Dt <- as.Date( ISOdate( mjo30$year, mjo30$month, mjo30$date ) )
>
> You could then use indexing
>
> mjo30[ date[1] == mjo30$Dt, ]
>
> or
>
> mjo30[ mjo30$Dt %in% date, ]
>
> but the subset function would not work in this case because you have two
different objects (a column in mjo30 and a vector in your global environment)
both referred to as 'date'.
>
> On January 13, 2020 8:53:38 PM PST, ani jaya <gaaauul at gmail.com>
wrote:
> >Good morning R-Help,
> >
> >I have a dataframe with 7 columns and 10000+ rows. I want to
> >subset/extract
> >those data frame with specific date (not in order). Here the head of my
> >data frame:
> >
> >head(mjo30) year month date rmm1 rmm2 phase amp
> >1 1986 1 1 -0.326480 -1.55895 2 1.59277
> >2 1986 1 2 -0.417700 -1.82689 2 1.87403
> >3 1986 1 3 0.032915 -2.40150 3 2.40172
> >4 1986 1 4 0.492743 -2.49216 3 2.54041
> >5 1986 1 5 0.585106 -2.76866 3 2.82981
> >6 1986 1 6 0.665013 -3.13883 3 3.20851
> >
> >and here my specific date:
> >> date [1] "1986-04-25" "1987-06-10"
"1988-09-03" "1989-10-05"
> >"1990-10-26" "1991-05-07" "1992-11-19"
"1993-01-23" "1994-12-04"
> >[10] "1995-05-11" "1996-10-04"
"1997-04-29" "1998-04-08" "1999-01-16"
> >"2000-08-01" "2001-10-02" "2002-05-08"
"2003-04-01"
> >[19] "2004-05-07" "2005-09-02"
"2006-12-30" "2007-09-03" "2008-10-24"
> >"2009-11-14" "2010-07-05" "2011-04-30"
"2012-05-21"
> >[28] "2013-04-07" "2014-05-07"
"2015-07-26"
> >
> >And also I was confused when I dput my date, it show like this:
> >> dput(date)structure(c(5958, 6369, 6820, 7217, 7603, 7796, 8358,
8423,
> >9103,
> >9261, 9773, 9980, 10324, 10607, 11170, 11597, 11815, 12143, 12545,
> >13028, 13512, 13759, 14176, 14562, 14795, 15094, 15481, 15802,
> >16197, 16642), class = "Date")
> >
> >what is that mean? I mean why it is not recall the dates but some
> >values (5958,6369,7217,..)?
> >
> >Any comment and recommendation is appreciate. Thank you.
> >
> >Best,
> >
> >Ani
> >
> > [[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.
>
> --
> Sent from my phone. Please excuse my brevity.
Dear Jeff and Bert,
Thank you for your correction and explanation.
Yes, I need more study regarding date format and
sorry for HTML mail.
I was able to subset data that I want.
mjo30<-read.table("rmm.txt", header=FALSE, skip=4234, nrows=10957)
mjo30$V8<-NULL
names(mjo30)<-c("year","month","day",
"rmm1","rmm2","phase","amp")
mjo3<-as.Date(with(mjo30,paste(year,month, day,
sep="-")),"%Y-%m-%d")
mjo<-mjo30[which(mjo3%in%date),]
head(mjo)
year month day rmm1 rmm2 phase amp
115 1986 4 25 -0.319090 -0.363030 2 0.483332
526 1987 6 10 1.662870 0.291632 5 1.688250
977 1988 9 3 -0.604950 -0.299850 1 0.675181
1374 1989 10 5 0.972298 -0.461030 4 1.076060
1760 1990 10 26 -1.183110 -1.589810 2 1.981730
1953 1991 5 7 -0.317180 0.953061 7 1.004450
Best,
Ani
On Tue, Jan 14, 2020 at 3:56 PM ani jaya <gaaauul at gmail.com>
wrote:>
>
That's fine, but do note that the which() function is wholly unnecessary in your last line as R allows logical indexing. Perhaps another topic you need to study. -- Bert On Mon, Jan 13, 2020 at 10:56 PM ani jaya <gaaauul at gmail.com> wrote:> Dear Jeff and Bert, > > Thank you very much for your correction and explanation. > And yes, I need to study about date format more. > Sorry for HTML mail, don't realize. > > I was able to subset the data that I want. > > mjo30<-read.table("rmm.txt", header=FALSE, skip=4234, nrows=10957) > mjo30$V8<-NULL > names(mjo30)<-c("year","month","day", "rmm1","rmm2","phase","amp") > mjo3<-as.Date(with(mjo30,paste(year,month, day, sep="-")),"%Y-%m-%d") > mjo<-mjo30[which(mjo3%in%date),] > > head(mjo) > year month day rmm1 rmm2 phase amp > 115 1986 4 25 -0.319090 -0.363030 2 0.483332 > 526 1987 6 10 1.662870 0.291632 5 1.688250 > 977 1988 9 3 -0.604950 -0.299850 1 0.675181 > 1374 1989 10 5 0.972298 -0.461030 4 1.076060 > 1760 1990 10 26 -1.183110 -1.589810 2 1.981730 > 1953 1991 5 7 -0.317180 0.953061 7 1.004450 > > > Best, > Ani > > > On Tue, Jan 14, 2020 at 3:20 PM Jeff Newmiller <jdnewmil at dcn.davis.ca.us> > wrote: > > > > The dput function is for re-creating an R object in another R workspace, > so it uses fundamental base types to define objects. A Date is really the > number of days since a specific date (typically 1970-01-01) that get > converted to look like dates whenever you display or print them, so what > you are seiing are those numbers. If we enter the R code returned by dput > into our R session we will be able to see the dates. > > > > Your mjo30 table seems to call the day of the month the "date"... which > is confusing. I would combine those three columns into one like > > > > mjo30$Dt <- as.Date( ISOdate( mjo30$year, mjo30$month, mjo30$date ) ) > > > > You could then use indexing > > > > mjo30[ date[1] == mjo30$Dt, ] > > > > or > > > > mjo30[ mjo30$Dt %in% date, ] > > > > but the subset function would not work in this case because you have two > different objects (a column in mjo30 and a vector in your global > environment) both referred to as 'date'. > > > > On January 13, 2020 8:53:38 PM PST, ani jaya <gaaauul at gmail.com> wrote: > > >Good morning R-Help, > > > > > >I have a dataframe with 7 columns and 10000+ rows. I want to > > >subset/extract > > >those data frame with specific date (not in order). Here the head of my > > >data frame: > > > > > >head(mjo30) year month date rmm1 rmm2 phase amp > > >1 1986 1 1 -0.326480 -1.55895 2 1.59277 > > >2 1986 1 2 -0.417700 -1.82689 2 1.87403 > > >3 1986 1 3 0.032915 -2.40150 3 2.40172 > > >4 1986 1 4 0.492743 -2.49216 3 2.54041 > > >5 1986 1 5 0.585106 -2.76866 3 2.82981 > > >6 1986 1 6 0.665013 -3.13883 3 3.20851 > > > > > >and here my specific date: > > >> date [1] "1986-04-25" "1987-06-10" "1988-09-03" "1989-10-05" > > >"1990-10-26" "1991-05-07" "1992-11-19" "1993-01-23" "1994-12-04" > > >[10] "1995-05-11" "1996-10-04" "1997-04-29" "1998-04-08" "1999-01-16" > > >"2000-08-01" "2001-10-02" "2002-05-08" "2003-04-01" > > >[19] "2004-05-07" "2005-09-02" "2006-12-30" "2007-09-03" "2008-10-24" > > >"2009-11-14" "2010-07-05" "2011-04-30" "2012-05-21" > > >[28] "2013-04-07" "2014-05-07" "2015-07-26" > > > > > >And also I was confused when I dput my date, it show like this: > > >> dput(date)structure(c(5958, 6369, 6820, 7217, 7603, 7796, 8358, 8423, > > >9103, > > >9261, 9773, 9980, 10324, 10607, 11170, 11597, 11815, 12143, 12545, > > >13028, 13512, 13759, 14176, 14562, 14795, 15094, 15481, 15802, > > >16197, 16642), class = "Date") > > > > > >what is that mean? I mean why it is not recall the dates but some > > >values (5958,6369,7217,..)? > > > > > >Any comment and recommendation is appreciate. Thank you. > > > > > >Best, > > > > > >Ani > > > > > > [[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. > > > > -- > > Sent from my phone. Please excuse my brevity. > > ______________________________________________ > 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. >[[alternative HTML version deleted]]
Thank you Bert. And yes another topic to study. On Tue, Jan 14, 2020 at 4:10 PM Bert Gunter <bgunter.4567 at gmail.com> wrote:> > That's fine, but do note that the which() function is wholly unnecessary in your last line as R allows logical indexing. Perhaps another topic you need to study. > > -- Bert > > > > On Mon, Jan 13, 2020 at 10:56 PM ani jaya <gaaauul at gmail.com> wrote: >> >> Dear Jeff and Bert, >> >> Thank you very much for your correction and explanation. >> And yes, I need to study about date format more. >> Sorry for HTML mail, don't realize. >> >> I was able to subset the data that I want. >> >> mjo30<-read.table("rmm.txt", header=FALSE, skip=4234, nrows=10957) >> mjo30$V8<-NULL >> names(mjo30)<-c("year","month","day", "rmm1","rmm2","phase","amp") >> mjo3<-as.Date(with(mjo30,paste(year,month, day, sep="-")),"%Y-%m-%d") >> mjo<-mjo30[which(mjo3%in%date),] >> >> head(mjo) >> year month day rmm1 rmm2 phase amp >> 115 1986 4 25 -0.319090 -0.363030 2 0.483332 >> 526 1987 6 10 1.662870 0.291632 5 1.688250 >> 977 1988 9 3 -0.604950 -0.299850 1 0.675181 >> 1374 1989 10 5 0.972298 -0.461030 4 1.076060 >> 1760 1990 10 26 -1.183110 -1.589810 2 1.981730 >> 1953 1991 5 7 -0.317180 0.953061 7 1.004450 >> >> >> Best, >> Ani >> >> >> On Tue, Jan 14, 2020 at 3:20 PM Jeff Newmiller <jdnewmil at dcn.davis.ca.us> wrote: >> > >> > The dput function is for re-creating an R object in another R workspace, so it uses fundamental base types to define objects. A Date is really the number of days since a specific date (typically 1970-01-01) that get converted to look like dates whenever you display or print them, so what you are seiing are those numbers. If we enter the R code returned by dput into our R session we will be able to see the dates. >> > >> > Your mjo30 table seems to call the day of the month the "date"... which is confusing. I would combine those three columns into one like >> > >> > mjo30$Dt <- as.Date( ISOdate( mjo30$year, mjo30$month, mjo30$date ) ) >> > >> > You could then use indexing >> > >> > mjo30[ date[1] == mjo30$Dt, ] >> > >> > or >> > >> > mjo30[ mjo30$Dt %in% date, ] >> > >> > but the subset function would not work in this case because you have two different objects (a column in mjo30 and a vector in your global environment) both referred to as 'date'. >> > >> > On January 13, 2020 8:53:38 PM PST, ani jaya <gaaauul at gmail.com> wrote: >> > >Good morning R-Help, >> > > >> > >I have a dataframe with 7 columns and 10000+ rows. I want to >> > >subset/extract >> > >those data frame with specific date (not in order). Here the head of my >> > >data frame: >> > > >> > >head(mjo30) year month date rmm1 rmm2 phase amp >> > >1 1986 1 1 -0.326480 -1.55895 2 1.59277 >> > >2 1986 1 2 -0.417700 -1.82689 2 1.87403 >> > >3 1986 1 3 0.032915 -2.40150 3 2.40172 >> > >4 1986 1 4 0.492743 -2.49216 3 2.54041 >> > >5 1986 1 5 0.585106 -2.76866 3 2.82981 >> > >6 1986 1 6 0.665013 -3.13883 3 3.20851 >> > > >> > >and here my specific date: >> > >> date [1] "1986-04-25" "1987-06-10" "1988-09-03" "1989-10-05" >> > >"1990-10-26" "1991-05-07" "1992-11-19" "1993-01-23" "1994-12-04" >> > >[10] "1995-05-11" "1996-10-04" "1997-04-29" "1998-04-08" "1999-01-16" >> > >"2000-08-01" "2001-10-02" "2002-05-08" "2003-04-01" >> > >[19] "2004-05-07" "2005-09-02" "2006-12-30" "2007-09-03" "2008-10-24" >> > >"2009-11-14" "2010-07-05" "2011-04-30" "2012-05-21" >> > >[28] "2013-04-07" "2014-05-07" "2015-07-26" >> > > >> > >And also I was confused when I dput my date, it show like this: >> > >> dput(date)structure(c(5958, 6369, 6820, 7217, 7603, 7796, 8358, 8423, >> > >9103, >> > >9261, 9773, 9980, 10324, 10607, 11170, 11597, 11815, 12143, 12545, >> > >13028, 13512, 13759, 14176, 14562, 14795, 15094, 15481, 15802, >> > >16197, 16642), class = "Date") >> > > >> > >what is that mean? I mean why it is not recall the dates but some >> > >values (5958,6369,7217,..)? >> > > >> > >Any comment and recommendation is appreciate. Thank you. >> > > >> > >Best, >> > > >> > >Ani >> > > >> > > [[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. >> > >> > -- >> > Sent from my phone. Please excuse my brevity. >> >> ______________________________________________ >> 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.
Hi Bert I sometimes use indexing with "which" too, depends on desired result, especially with data frames. x <- 1:10 x[5:6] <- NA> xd <- data.frame(x, y=rnorm(10))> xd[xd$x>3,]x y 4 4 -1.5086790 NA NA NA NA.1 NA NA 7 7 -0.2302614 8 8 -0.1660547 9 9 1.3197811 10 10 -0.3234029> xd[which(xd$x>3),]x y 4 4 -1.5086790 7 7 -0.2302614 8 8 -0.1660547 9 9 1.3197811 10 10 -0.3234029 The variant without which retains NA values, which may be sometimes undesirable. Cheers Petr> -----Original Message----- > From: R-help <r-help-bounces at r-project.org> On Behalf Of Bert Gunter > Sent: Tuesday, January 14, 2020 8:10 AM > To: ani jaya <gaaauul at gmail.com> > Cc: r-help <r-help at r-project.org> > Subject: Re: [R] Subset a data frame with specific date > > That's fine, but do note that the which() function is wholly unnecessaryin> your last line as R allows logical indexing. Perhaps another topic youneed to> study. > > -- Bert > > > > On Mon, Jan 13, 2020 at 10:56 PM ani jaya <gaaauul at gmail.com> wrote: > > > Dear Jeff and Bert, > > > > Thank you very much for your correction and explanation. > > And yes, I need to study about date format more. > > Sorry for HTML mail, don't realize. > > > > I was able to subset the data that I want. > > > > mjo30<-read.table("rmm.txt", header=FALSE, skip=4234, nrows=10957) > > mjo30$V8<-NULL names(mjo30)<-c("year","month","day", > > "rmm1","rmm2","phase","amp") > > mjo3<-as.Date(with(mjo30,paste(year,month, day, sep="-")),"%Y-%m-%d") > > mjo<-mjo30[which(mjo3%in%date),] > > > > head(mjo) > > year month day rmm1 rmm2 phase amp > > 115 1986 4 25 -0.319090 -0.363030 2 0.483332 > > 526 1987 6 10 1.662870 0.291632 5 1.688250 > > 977 1988 9 3 -0.604950 -0.299850 1 0.675181 > > 1374 1989 10 5 0.972298 -0.461030 4 1.076060 > > 1760 1990 10 26 -1.183110 -1.589810 2 1.981730 > > 1953 1991 5 7 -0.317180 0.953061 7 1.004450 > > > > > > Best, > > Ani > > > > > > On Tue, Jan 14, 2020 at 3:20 PM Jeff Newmiller > > <jdnewmil at dcn.davis.ca.us> > > wrote: > > > > > > The dput function is for re-creating an R object in another R > > > workspace, > > so it uses fundamental base types to define objects. A Date is really > > the number of days since a specific date (typically 1970-01-01) that > > get converted to look like dates whenever you display or print them, > > so what you are seiing are those numbers. If we enter the R code > > returned by dput into our R session we will be able to see the dates. > > > > > > Your mjo30 table seems to call the day of the month the "date"... > > > which > > is confusing. I would combine those three columns into one like > > > > > > mjo30$Dt <- as.Date( ISOdate( mjo30$year, mjo30$month, mjo30$date ) > > > ) > > > > > > You could then use indexing > > > > > > mjo30[ date[1] == mjo30$Dt, ] > > > > > > or > > > > > > mjo30[ mjo30$Dt %in% date, ] > > > > > > but the subset function would not work in this case because you have > > > two > > different objects (a column in mjo30 and a vector in your global > > environment) both referred to as 'date'. > > > > > > On January 13, 2020 8:53:38 PM PST, ani jaya <gaaauul at gmail.com> > wrote: > > > >Good morning R-Help, > > > > > > > >I have a dataframe with 7 columns and 10000+ rows. I want to > > > >subset/extract those data frame with specific date (not in order). > > > >Here the head of my data frame: > > > > > > > >head(mjo30) year month date rmm1 rmm2 phase amp > > > >1 1986 1 1 -0.326480 -1.55895 2 1.59277 > > > >2 1986 1 2 -0.417700 -1.82689 2 1.87403 > > > >3 1986 1 3 0.032915 -2.40150 3 2.40172 > > > >4 1986 1 4 0.492743 -2.49216 3 2.54041 > > > >5 1986 1 5 0.585106 -2.76866 3 2.82981 > > > >6 1986 1 6 0.665013 -3.13883 3 3.20851 > > > > > > > >and here my specific date: > > > >> date [1] "1986-04-25" "1987-06-10" "1988-09-03" "1989-10-05" > > > >"1990-10-26" "1991-05-07" "1992-11-19" "1993-01-23" "1994-12-04" > > > >[10] "1995-05-11" "1996-10-04" "1997-04-29" "1998-04-08" "1999-01- > 16" > > > >"2000-08-01" "2001-10-02" "2002-05-08" "2003-04-01" > > > >[19] "2004-05-07" "2005-09-02" "2006-12-30" "2007-09-03" "2008-10- > 24" > > > >"2009-11-14" "2010-07-05" "2011-04-30" "2012-05-21" > > > >[28] "2013-04-07" "2014-05-07" "2015-07-26" > > > > > > > >And also I was confused when I dput my date, it show like this: > > > >> dput(date)structure(c(5958, 6369, 6820, 7217, 7603, 7796, 8358, > > > >> 8423, > > > >9103, > > > >9261, 9773, 9980, 10324, 10607, 11170, 11597, 11815, 12143, 12545, > > > >13028, 13512, 13759, 14176, 14562, 14795, 15094, 15481, 15802, > > > >16197, 16642), class = "Date") > > > > > > > >what is that mean? I mean why it is not recall the dates but some > > > >values (5958,6369,7217,..)? > > > > > > > >Any comment and recommendation is appreciate. Thank you. > > > > > > > >Best, > > > > > > > >Ani > > > > > > > > [[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. > > > > > > -- > > > Sent from my phone. Please excuse my brevity. > > > > ______________________________________________ > > 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. > > > > [[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.