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Allan Tanaka

2017-Mar-16 02:16 UTC

[R] HELP ME: Fill NA Values from the previous Non-NA Values

Hi. Thanks for the function. My bad, after looking at the csv file, it seems
that NA values come not only from previous Non-NA values but also from the next
Non-NA values. Example:
| NCQ05 | 11.395 |
| NCQ05 | 11.395 |
| NCQ05 |  |
| NCQ06 |  |
| NCQ06 | 13 |
| NCQ06 | 13 |


If i use the function, then the blank row would be filled with 11.395, instead
of filling with 11.395 and 13.
Does it mean that the function can be modified like this?
locf2 <- function(x, initial=NA, IS_BAD = is.na) {
? ? # Replace 'bad' values in 'x' with last previous non-bad
value.
? ? # If no previous non-bad value, replace with 'initial'.
? ? stopifnot(is.function(IS_BAD))
? ? good <- !IS_BAD(x)
? ? stopifnot(is.logical(good), length(good) == length(x), !anyNA(good))
? ? i <- cumsum(good)
? ? x <- x[c(1,which(good))][i+1]
? ? x <- x[c(1,which(good))][i+2]
? ? x[i==0] <- initial
? ? x
}    On Thursday, 16 March 2017, 1:17, William Dunlap <wdunlap at
tibco.com> wrote:
 

 You could use the following function

locf2 <- function(x, initial=NA, IS_BAD = is.na) {
? ? # Replace 'bad' values in 'x' with last previous non-bad
value.
? ? # If no previous non-bad value, replace with 'initial'.
? ? stopifnot(is.function(IS_BAD))
? ? good <- !IS_BAD(x)
? ? stopifnot(is.logical(good), length(good) == length(x), !anyNA(good))
? ? i <- cumsum(good)
? ? x <- x[c(1,which(good))][i+1]
? ? x[i==0] <- initial
? ? x
}

as in
> locf2(c("", "A", "B", "",
"", "C", ""), IS_BAD=function(x)x=="",
initial="---")[1] "---" "A"? "B"? "B"? "B"?
"C"? "C">
locf2(factor(c(NA,"Small","Medium",NA,"Large",NA,NA,NA,"Small")))[1] <NA>? Small? Medium Medium Large? Large? Large? Large? Small
Levels: Large Medium Small> locf2(c(12, NA, 10, 11, NA, NA))[1] 12 12 10 11 11 11

Bill Dunlap
TIBCO Software
wdunlap tibco.com


On Wed, Mar 15, 2017 at 4:08 AM, Allan Tanaka <allantanaka11 at yahoo.com>
wrote:> The following is an example:
>
> | Item_Identifier | Item_Weight |
> | FDP10 | 19 |
> | FDP10 |? |
> | DRI11 | 8.26 |
> | DRI11 |? |
> | FDW12 | 8.315 |
> | FDW12 |? |
>
>
> The following is the one that i want to be. That is, filling NA values from
the previous Non-NA values.
> | Item_Identifier | Item_Weight |
> | FDP10 | 19 |
> | FDP10 | 19 |
> | DRI11 | 8.26 |
> | DRI11 | 8.26 |
> | FDW12 | 8.315 |
> | FDW12 | 8.315 |
>
>
> My current code data frame: train <- read.csv("Train.csv",
header=T,sep = ",",na.strings = c(""," ",NA))
>
>
> Some people suggest to use na.locf function but in my case, i don't
have numeric unique values in my Item_Identifier coloumn but rather it's
characters. Not sure what to solve this problem.
>
>
>? ? ? ? [[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.

   
	[[alternative HTML version deleted]]

PIKAL Petr

2017-Mar-16 13:38 UTC

head link

[R] HELP ME: Fill NA Values from the previous Non-NA Values

Hi

You can achieve exactly what you want by using ave/na.locf twice

dat<-data.frame(ie=rep(letters[1:3], each=3), iw=rnorm(9))
dat[c(3, 4),2]<-NA> dat  ie          iw
1  a  1.07254438
2  a  0.53067188
3  a          NA
4  b          NA
5  b -0.09767088
6  b -1.02719060
7  c  2.35787246
8  c -0.07513048
9  c -0.17164728

dat$iw <- ave(dat$iw, dat$ie, FUN=function(x) na.locf(x, na.rm=FALSE))
dat$iw <- ave(dat$iw, dat$ie, FUN=function(x) na.locf(x, na.rm=FALSE,
fromLast=TRUE))
> dat  ie          iw
1  a  1.07254438
2  a  0.53067188
3  a  0.53067188
4  b -0.09767088
5  b -0.09767088
6  b -1.02719060
7  c  2.35787246
8  c -0.07513048
9  c -0.17164728>
Cheers
Petr
> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Allan
> Tanaka
> Sent: Thursday, March 16, 2017 3:16 AM
> To: William Dunlap <wdunlap at tibco.com>
> Cc: r-help at r-project.org
> Subject: Re: [R] HELP ME: Fill NA Values from the previous Non-NA Values
>
>  Hi. Thanks for the function. My bad, after looking at the csv file, it
seems that
> NA values come not only from previous Non-NA values but also from the
> next Non-NA values. Example:
> | NCQ05 | 11.395 |
> | NCQ05 | 11.395 |
> | NCQ05 |  |
> | NCQ06 |  |
> | NCQ06 | 13 |
> | NCQ06 | 13 |
>
>
> If i use the function, then the blank row would be filled with 11.395,
instead
> of filling with 11.395 and 13.
> Does it mean that the function can be modified like this?
> locf2 <- function(x, initial=NA, IS_BAD = is.na) {
>     # Replace 'bad' values in 'x' with last previous
non-bad value.
>     # If no previous non-bad value, replace with 'initial'.
>     stopifnot(is.function(IS_BAD))
>     good <- !IS_BAD(x)
>     stopifnot(is.logical(good), length(good) == length(x), !anyNA(good))
>     i <- cumsum(good)
>     x <- x[c(1,which(good))][i+1]
>     x <- x[c(1,which(good))][i+2]
>     x[i==0] <- initial
>     x
> }    On Thursday, 16 March 2017, 1:17, William Dunlap <wdunlap at
tibco.com>
> wrote:
>
>
>  You could use the following function
>
> locf2 <- function(x, initial=NA, IS_BAD = is.na) {
>     # Replace 'bad' values in 'x' with last previous
non-bad value.
>     # If no previous non-bad value, replace with 'initial'.
>     stopifnot(is.function(IS_BAD))
>     good <- !IS_BAD(x)
>     stopifnot(is.logical(good), length(good) == length(x), !anyNA(good))
>     i <- cumsum(good)
>     x <- x[c(1,which(good))][i+1]
>     x[i==0] <- initial
>     x
> }
>
> as in
>
> > locf2(c("", "A", "B", "",
"", "C", ""), IS_BAD=function(x)x=="",
> > initial="---")
> [1] "---" "A"  "B"  "B" 
"B"  "C"  "C"
> >
locf2(factor(c(NA,"Small","Medium",NA,"Large",NA,NA,NA,"Small")))
> [1] <NA>  Small  Medium Medium Large  Large  Large  Large  Small
> Levels: Large Medium Small
> > locf2(c(12, NA, 10, 11, NA, NA))
> [1] 12 12 10 11 11 11
>
> Bill Dunlap
> TIBCO Software
> wdunlap tibco.com
>
>
> On Wed, Mar 15, 2017 at 4:08 AM, Allan Tanaka <allantanaka11 at
yahoo.com>
> wrote:
> > The following is an example:
> >
> > | Item_Identifier | Item_Weight |
> > | FDP10 | 19 |
> > | FDP10 |  |
> > | DRI11 | 8.26 |
> > | DRI11 |  |
> > | FDW12 | 8.315 |
> > | FDW12 |  |
> >
> >
> > The following is the one that i want to be. That is, filling NA values
from the
> previous Non-NA values.
> > | Item_Identifier | Item_Weight |
> > | FDP10 | 19 |
> > | FDP10 | 19 |
> > | DRI11 | 8.26 |
> > | DRI11 | 8.26 |
> > | FDW12 | 8.315 |
> > | FDW12 | 8.315 |
> >
> >
> > My current code data frame: train <-
read.csv("Train.csv",
> > header=T,sep = ",",na.strings = c("","
",NA))
> >
> >
> > Some people suggest to use na.locf function but in my case, i
don't have
> numeric unique values in my Item_Identifier coloumn but rather it's
> characters. Not sure what to solve this problem.
> >
> >
> >        [[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.
>
>
>
>       [[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.
________________________________
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- 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
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- 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
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The sender of this e-mail shall not be liable for any possible damage caused by
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recipient, or the existence of such authorization is known to the recipient of
the person represented by the recipient.

Allan Tanaka

2017-Mar-16 15:48 UTC

head link

[R] HELP ME: Fill NA Values from the previous Non-NA Values

Amazing! Thanks for your kindness. 

    On Thursday, 16 March 2017, 20:38, PIKAL Petr <petr.pikal at
precheza.cz> wrote:
 

 Hi

You can achieve exactly what you want by using ave/na.locf twice

dat<-data.frame(ie=rep(letters[1:3], each=3), iw=rnorm(9))
dat[c(3, 4),2]<-NA> dat? ie? ? ? ? ? iw
1? a? 1.07254438
2? a? 0.53067188
3? a? ? ? ? ? NA
4? b? ? ? ? ? NA
5? b -0.09767088
6? b -1.02719060
7? c? 2.35787246
8? c -0.07513048
9? c -0.17164728

dat$iw <- ave(dat$iw, dat$ie, FUN=function(x) na.locf(x, na.rm=FALSE))
dat$iw <- ave(dat$iw, dat$ie, FUN=function(x) na.locf(x, na.rm=FALSE,
fromLast=TRUE))
> dat? ie? ? ? ? ? iw
1? a? 1.07254438
2? a? 0.53067188
3? a? 0.53067188
4? b -0.09767088
5? b -0.09767088
6? b -1.02719060
7? c? 2.35787246
8? c -0.07513048
9? c -0.17164728>
Cheers
Petr
> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Allan
> Tanaka
> Sent: Thursday, March 16, 2017 3:16 AM
> To: William Dunlap <wdunlap at tibco.com>
> Cc: r-help at r-project.org
> Subject: Re: [R] HELP ME: Fill NA Values from the previous Non-NA Values
>
>? Hi. Thanks for the function. My bad, after looking at the csv file, it
seems that
> NA values come not only from previous Non-NA values but also from the
> next Non-NA values. Example:
> | NCQ05 | 11.395 |
> | NCQ05 | 11.395 |
> | NCQ05 |? |
> | NCQ06 |? |
> | NCQ06 | 13 |
> | NCQ06 | 13 |
>
>
> If i use the function, then the blank row would be filled with 11.395,
instead
> of filling with 11.395 and 13.
> Does it mean that the function can be modified like this?
> locf2 <- function(x, initial=NA, IS_BAD = is.na) {
>? ? # Replace 'bad' values in 'x' with last previous non-bad
value.
>? ? # If no previous non-bad value, replace with 'initial'.
>? ? stopifnot(is.function(IS_BAD))
>? ? good <- !IS_BAD(x)
>? ? stopifnot(is.logical(good), length(good) == length(x), !anyNA(good))
>? ? i <- cumsum(good)
>? ? x <- x[c(1,which(good))][i+1]
>? ? x <- x[c(1,which(good))][i+2]
>? ? x[i==0] <- initial
>? ? x
> }? ? On Thursday, 16 March 2017, 1:17, William Dunlap <wdunlap at
tibco.com>
> wrote:
>
>
>? You could use the following function
>
> locf2 <- function(x, initial=NA, IS_BAD = is.na) {
>? ? # Replace 'bad' values in 'x' with last previous non-bad
value.
>? ? # If no previous non-bad value, replace with 'initial'.
>? ? stopifnot(is.function(IS_BAD))
>? ? good <- !IS_BAD(x)
>? ? stopifnot(is.logical(good), length(good) == length(x), !anyNA(good))
>? ? i <- cumsum(good)
>? ? x <- x[c(1,which(good))][i+1]
>? ? x[i==0] <- initial
>? ? x
> }
>
> as in
>
> > locf2(c("", "A", "B", "",
"", "C", ""), IS_BAD=function(x)x=="",
> > initial="---")
> [1] "---" "A"? "B"? "B"?
"B"? "C"? "C"
> >
locf2(factor(c(NA,"Small","Medium",NA,"Large",NA,NA,NA,"Small")))
> [1] <NA>? Small? Medium Medium Large? Large? Large? Large? Small
> Levels: Large Medium Small
> > locf2(c(12, NA, 10, 11, NA, NA))
> [1] 12 12 10 11 11 11
>
> Bill Dunlap
> TIBCO Software
> wdunlap tibco.com
>
>
> On Wed, Mar 15, 2017 at 4:08 AM, Allan Tanaka <allantanaka11 at
yahoo.com>
> wrote:
> > The following is an example:
> >
> > | Item_Identifier | Item_Weight |
> > | FDP10 | 19 |
> > | FDP10 |? |
> > | DRI11 | 8.26 |
> > | DRI11 |? |
> > | FDW12 | 8.315 |
> > | FDW12 |? |
> >
> >
> > The following is the one that i want to be. That is, filling NA values
from the
> previous Non-NA values.
> > | Item_Identifier | Item_Weight |
> > | FDP10 | 19 |
> > | FDP10 | 19 |
> > | DRI11 | 8.26 |
> > | DRI11 | 8.26 |
> > | FDW12 | 8.315 |
> > | FDW12 | 8.315 |
> >
> >
> > My current code data frame: train <-
read.csv("Train.csv",
> > header=T,sep = ",",na.strings = c("","
",NA))
> >
> >
> > Some people suggest to use na.locf function but in my case, i
don't have
> numeric unique values in my Item_Identifier coloumn but rather it's
> characters. Not sure what to solve this problem.
> >
> >
> >? ? ? ? [[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.
>
>
>
>? ? ? [[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.
________________________________
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 - Mar 2017 - HELP ME: Fill NA Values from the previous Non-NA Values

[R] HELP ME: Fill NA Values from the previous Non-NA Values

[R] HELP ME: Fill NA Values from the previous Non-NA Values

[R] HELP ME: Fill NA Values from the previous Non-NA Values