[R] Replace NAs in split lists
PIKAL Petr
petr.pikal at precheza.cz
Tue Jan 9 06:51:28 CET 2018
Hi
Yes, that is why I mentioned "the example". Of course if there are missing values in other columns or data layout is different, na.locf could give undesired result.
However it is simple and works with data similar to the example.
Cheers
Petr
> -----Original Message-----
> From: Jeff Newmiller [mailto:jdnewmil at dcn.davis.ca.us]
> Sent: Monday, January 8, 2018 4:45 PM
> To: Eric Berger <ericjberger at gmail.com>
> Cc: PIKAL Petr <petr.pikal at precheza.cz>; r-help at r-project.org; Ek Esawi
> <esawiek at gmail.com>
> Subject: Re: [R] Replace NAs in split lists
>
> "Enforce" is overstating it... results will differ if there are no non-NA values for
> a given ID, and there is a potential further discrepancy if there are multiple
> non-NA values. But these issues were not identified by the OP, so may not be
> relevant in their case.
> --
> Sent from my phone. Please excuse my brevity.
>
> On January 8, 2018 6:41:33 AM PST, Eric Berger <ericjberger at gmail.com>
> wrote:
> >You can enforce these assumptions by sorting on multiple columns, which
> >leads to
> >
> >na.locf(df1[ order(df1$ID,df1$Value), ])
> >
> >
> >
> >On Mon, Jan 8, 2018 at 4:19 PM, Jeff Newmiller
> ><jdnewmil at dcn.davis.ca.us>
> >wrote:
> >
> >> Yes, you are right if the IDs are always sequentially-adjacent and
> >the
> >> first non-NA value appears in the first record for each ID.
> >> --
> >> Sent from my phone. Please excuse my brevity.
> >>
> >> On January 8, 2018 2:29:40 AM PST, PIKAL Petr
> ><petr.pikal at precheza.cz>
> >> wrote:
> >> >Hi
> >> >
> >> >With the example, na.locf seems to be the easiest way.
> >> >> library(zoo)
> >> >
> >> >> na.locf(df1)
> >> > ID ID_2 Firist Value
> >> >1 a aa TRUE 2
> >> >2 a ab FALSE 2
> >> >3 a ac FALSE 2
> >> >4 b aa TRUE 5
> >> >5 b ab FALSE 5
> >> >
> >> >Cheers
> >> >Petr
> >> >
> >> >> -----Original Message-----
> >> >> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of
> >Jeff
> >> >> Newmiller
> >> >> Sent: Monday, January 8, 2018 9:13 AM
> >> >> To: r-help at r-project.org; Ek Esawi <esawiek at gmail.com>
> >> >> Subject: Re: [R] Replace NAs in split lists
> >> >>
> >> >> Upon closer examination I see that you are not using the split
> >> >version of
> >> >> df1 as I usually would, so here is a reproducible example:
> >> >>
> >> >> #----
> >> >> df1 <- read.table( text=
> >> >> "ID ID_2 Firist Value
> >> >> 1 a aa TRUE 2
> >> >> 2 a ab FALSE NA
> >> >> 3 a ac FALSE NA
> >> >> 4 b aa TRUE 5
> >> >> 5 b ab FALSE NA
> >> >> ", header=TRUE, as.is=TRUE )
> >> >>
> >> >> sdf <- split( df1, df1$ID )
> >> >> # note the extra [ 1 ] in case you have more than one non-NA value
> >#
> >> >per ID
> >> >> sdf2 <- lapply( sdf
> >> >> , function( z ) {
> >> >> z$Value <- ifelse( is.na( z$Value )
> >> >> , z$Value[ !is.na( z$Value ) ][
> >1
> >> >]
> >> >> , z$Value
> >> >> )
> >> >> z
> >> >> }
> >> >> )
> >> >> df2 <- do.call( rbind, sdf2 )
> >> >> df2
> >> >> #> ID ID_2 Firist Value
> >> >> #> a.1 a aa TRUE 2
> >> >> #> a.2 a ab FALSE 2
> >> >> #> a.3 a ac FALSE 2
> >> >> #> b.4 b aa TRUE 5
> >> >> #> b.5 b ab FALSE 5
> >> >>
> >> >> # or using tidyverse methods
> >> >>
> >> >> library(dplyr)
> >> >> #>
> >> >> #> Attaching package: 'dplyr'
> >> >> #> The following objects are masked from 'package:stats':
> >> >> #>
> >> >> #> filter, lag
> >> >> #> The following objects are masked from 'package:base':
> >> >> #>
> >> >> #> intersect, setdiff, setequal, union
> >> >> df3 <- ( df1
> >> >> %>% group_by( ID )
> >> >> %>% do({
> >> >> mutate( .
> >> >> , Value = ifelse( is.na( Value )
> >> >> , Value[ !is.na( Value ) ][ 1
> >]
> >> >> , Value
> >> >> )
> >> >> )
> >> >> })
> >> >> %>% ungroup
> >> >> )
> >> >> df3
> >> >> #> # A tibble: 5 x 4
> >> >> #> ID ID_2 Firist Value
> >> >> #> <chr> <chr> <lgl> <int>
> >> >> #> 1 a aa T 2
> >> >> #> 2 a ab F 2
> >> >> #> 3 a ac F 2
> >> >> #> 4 b aa T 5
> >> >> #> 5 b ab F 5
> >> >> #----
> >> >>
> >> >> On Sun, 7 Jan 2018, Jeff Newmiller wrote:
> >> >>
> >> >> > Why do you want to modify df1?
> >> >> >
> >> >> > Why not just reassemble the parts as a new data frame and use
> >that
> >> >> > going forward in your calculations? That is generally the
> >preferred
> >> >> > approach in R so you can re-do your calculations easily if you
> >find
> >> >a
> >> >> > mistake later.
> >> >> > --
> >> >> > Sent from my phone. Please excuse my brevity.
> >> >> >
> >> >> > On January 7, 2018 7:35:59 PM PST, Ek Esawi <esawiek at gmail.com>
> >> >wrote:
> >> >> >> I just came up with a solution right after i posted the
> >question,
> >> >but
> >> >> >> i figured there must be a better and shorter one.than my
> >solution
> >> >> >> sdf1[[1]][1,4]<-lapplyresults[[1]]
> >> >> >> sdf1[[2]][1,4]<-lapplyresults[[2]]
> >> >> >>
> >> >> >> EK
> >> >> >>
> >> >> >> On Sun, Jan 7, 2018 at 10:13 PM, Ek Esawi <esawiek at gmail.com>
> >> >wrote:
> >> >> >>> Hi all--
> >> >> >>>
> >> >> >>> I stumbled on this problem online. I did not like the solution
> >> >given
> >> >> >>> there which was a long UDF. I thought why cannot split and l/s
> >> >apply
> >> >> >>> work here. My aim is to split the data frame, use l/sapply,
> >make
> >> >> >>> changes on the split lists and combine the split lists to new
> >> >data
> >> >> >>> frame with the desired changes/output.
> >> >> >>>
> >> >> >>> The data frame shown below has a column named ID which has 2
> >> >> >> variables
> >> >> >>> a and b; i want to replace the NAs on the Value column by 2,
> >> >which
> >> >> >>> is the only numeric entry, for ID=a and by 5 for ID=b.
> >> >> >>>
> >> >> >>> I worked out the solution but could not replace the results in
> >> >the
> >> >> >> split lists.
> >> >> >>>
> >> >> >>> Original dataframe , df1
> >> >> >>> ID ID_2 Firist Value
> >> >> >>> 1 a aa TRUE 2
> >> >> >>> 2 a ab FALSE NA
> >> >> >>> 3 a ac FALSE NA
> >> >> >>> 4 b aa TRUE 5
> >> >> >>> 5 b ab FALSE NA
> >> >> >>> Sdf1
> >> >> >>> $a
> >> >> >>> ID ID_2 Firist Value
> >> >> >>> 1 a aa TRUE 2
> >> >> >>> 2 a ab FALSE NA
> >> >> >>> 3 a ac FALSE NA
> >> >> >>> $b
> >> >> >>> ID ID_2 Firist Value
> >> >> >>> 4 b aa TRUE 5
> >> >> >>> 5 b ab FALSE NA
> >> >> >>> Desired results
> >> >> >>> ID ID_2 Firist Value
> >> >> >>> 1 a aa TRUE 2
> >> >> >>> 2 a ab FALSE 2
> >> >> >>> 3 a ac FALSE 2
> >> >> >>>
> >> >> >>> $b
> >> >> >>> ID ID_2 Firist Value
> >> >> >>> 4 b aa TRUE 5
> >> >> >>> 5 b ab FALSE 5
> >> >> >>>
> >> >> >>> My code
> >> >> >>>
> >> >> >>> sdf <- split(df1,df$ID)
> >> >> >>> lapply(sdf, function(z)
> >> >> >> ifelse(is.na(z$Value),z$Value[!is.na(z$Value)],z$Value))
> >> >> >>> result:
> >> >> >>> $ a: num [1:3] 2 2 2
> >> >> >>> $ b: num [1:2] 5 5
> >> >> >>>
> >> >> >>> How could I put these two lists back in the split data frame,
> >> >sdf1?
> >> >> >>> Then I could use do.call to reassemble a data frame from the
> >> >split
> >> >> >>> lists,
> >> >> >>>
> >> >> >>> Thanks,
> >> >> >>> EK
> >> >> >>
> >> >> >> ______________________________________________
> >> >> >> 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.
> >> >> >
> >> >> > ______________________________________________
> >> >> > 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.
> >> >> >
> >> >>
> >> >>
> >> >-----------------------------------------------------------
> >> ----------------
> >> >> Jeff Newmiller The ..... .....
> >Go
> >> >Live...
> >> >> DCN:<jdnewmil at dcn.davis.ca.us> Basics: ##.#. ##.#.
> >Live
> >> >Go...
> >> >> Live: OO#.. Dead: OO#..
> >> >Playing
> >> >> Research Engineer (Solar/Batteries O.O#. #.O#.
> >with
> >> >> /Software/Embedded Controllers) .OO#. .OO#.
> >> >rocks...1k
> >> >>
> >> >> ______________________________________________
> >> >> 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 jakékoliv k němu připojené dokumenty jsou důvěrné a
> >jsou
> >> >určeny pouze jeho adresátům.
> >> >Jestliže jste obdržel(a) tento e-mail omylem, informujte laskavě
> >> >neprodleně jeho odesílatele. Obsah tohoto emailu i s přílohami a
> >jeho
> >> >kopie vymažte ze svého systému.
> >> >Nejste-li zamýšleným adresátem tohoto emailu, nejste oprávněni tento
> >> >email jakkoliv užívat, rozšiřovat, kopírovat či zveřejňovat.
> >> >Odesílatel e-mailu neodpovídá za eventuální škodu způsobenou
> >> >modifikacemi či zpožděním přenosu e-mailu.
> >> >
> >> >V případě, že je tento e-mail součástí obchodního jednání:
> >> >- vyhrazuje si odesílatel právo ukončit kdykoliv jednání o uzavření
> >> >smlouvy, a to z jakéhokoliv důvodu i bez uvedení důvodu.
> >> >- a obsahuje-li nabídku, je adresát oprávněn nabídku bezodkladně
> >> >přijmout; Odesílatel tohoto e-mailu (nabídky) vylučuje přijetí
> >nabídky
> >> >ze strany příjemce s dodatkem či odchylkou.
> >> >- trvá odesílatel na tom, že příslušná smlouva je uzavřena teprve
> >> >výslovným dosažením shody na všech jejích náležitostech.
> >> >- odesílatel tohoto emailu informuje, že není oprávněn uzavírat za
> >> >společnost žádné smlouvy s výjimkou případů, kdy k tomu byl písemně
> >> >zmocněn nebo písemně pověřen a takové pověření nebo plná moc byly
> >> >adresátovi tohoto emailu případně osobě, kterou adresát zastupuje,
> >> >předloženy nebo jejich existence je adresátovi či osobě jím
> >zastoupené
> >> >známá.
> >> >
> >> >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.
> >>
________________________________
Tento e-mail a jakékoliv k němu připojené dokumenty jsou důvěrné a jsou určeny pouze jeho adresátům.
Jestliže jste obdržel(a) tento e-mail omylem, informujte laskavě neprodleně jeho odesílatele. Obsah tohoto emailu i s přílohami a jeho kopie vymažte ze svého systému.
Nejste-li zamýšleným adresátem tohoto emailu, nejste oprávněni tento email jakkoliv užívat, rozšiřovat, kopírovat či zveřejňovat.
Odesílatel e-mailu neodpovídá za eventuální škodu způsobenou modifikacemi či zpožděním přenosu e-mailu.
V případě, že je tento e-mail součástí obchodního jednání:
- vyhrazuje si odesílatel právo ukončit kdykoliv jednání o uzavření smlouvy, a to z jakéhokoliv důvodu i bez uvedení důvodu.
- a obsahuje-li nabídku, je adresát oprávněn nabídku bezodkladně přijmout; Odesílatel tohoto e-mailu (nabídky) vylučuje přijetí nabídky ze strany příjemce s dodatkem či odchylkou.
- trvá odesílatel na tom, že příslušná smlouva je uzavřena teprve výslovným dosažením shody na všech jejích náležitostech.
- odesílatel tohoto emailu informuje, že není oprávněn uzavírat za společnost žádné smlouvy s výjimkou případů, kdy k tomu byl písemně zmocněn nebo písemně pověřen a takové pověření nebo plná moc byly adresátovi tohoto emailu případně osobě, kterou adresát zastupuje, předloženy nebo jejich existence je adresátovi či osobě jím zastoupené známá.
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.
More information about the R-help
mailing list