Hi everyone,
I am posting this because i know its easy and i cant for the life of me
figure out how to do it though i have tried and through a ridiculously
complex loop made it happen. I need to convert some list elements of NULL
value to 0s so they mesh with my data frame properly. So for
A<-list(1,NULL)
returns
[[1]]
[1] 1
[[2]]
NULL
Would instead return
[[1]]
[1] 1
[[2]]
[1] 0
The nabble posts seem to indicate dealing with NULLs can be tricky so i am
attributing my lack of success to that, mainly so i can live with myself and
asking the list such a simple question. Sorry again guys.
JR
--
View this message in context:
http://r.789695.n4.nabble.com/List-elements-of-NULL-to-value-tp3064384p3064384.html
Sent from the R help mailing list archive at Nabble.com.
Does
A = lapply(A,function(x)if is.null(x) 0 else x)
or
for(i in 1:length(A))if(is.null(A[[i]]))A[i] = 0
do what you want?
- Phil Spector
Statistical Computing Facility
Department of Statistics
UC Berkeley
spector at stat.berkeley.edu
On Mon, 29 Nov 2010, LCOG1 wrote:
>
> Hi everyone,
> I am posting this because i know its easy and i cant for the life of me
> figure out how to do it though i have tried and through a ridiculously
> complex loop made it happen. I need to convert some list elements of NULL
> value to 0s so they mesh with my data frame properly. So for
>
> A<-list(1,NULL)
>
> returns
>
> [[1]]
> [1] 1
>
> [[2]]
> NULL
>
> Would instead return
>
> [[1]]
> [1] 1
>
> [[2]]
> [1] 0
>
> The nabble posts seem to indicate dealing with NULLs can be tricky so i am
> attributing my lack of success to that, mainly so i can live with myself
and
> asking the list such a simple question. Sorry again guys.
>
> JR
> --
> View this message in context:
http://r.789695.n4.nabble.com/List-elements-of-NULL-to-value-tp3064384p3064384.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help at r-project.org mailing list
> 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.
>
Try this: replace(A, sapply(A, is.null), 0) On Mon, Nov 29, 2010 at 6:50 PM, LCOG1 <jroll@lcog.org> wrote:> > Hi everyone, > I am posting this because i know its easy and i cant for the life of me > figure out how to do it though i have tried and through a ridiculously > complex loop made it happen. I need to convert some list elements of NULL > value to 0s so they mesh with my data frame properly. So for > > A<-list(1,NULL) > > returns > > [[1]] > [1] 1 > > [[2]] > NULL > > Would instead return > > [[1]] > [1] 1 > > [[2]] > [1] 0 > > The nabble posts seem to indicate dealing with NULLs can be tricky so i am > attributing my lack of success to that, mainly so i can live with myself > and > asking the list such a simple question. Sorry again guys. > > JR > -- > View this message in context: > http://r.789695.n4.nabble.com/List-elements-of-NULL-to-value-tp3064384p3064384.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help@r-project.org mailing list > 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. >-- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40" S 49° 16' 22" O [[alternative HTML version deleted]]
Yes that works thank you, and as always I feel foolish for asking. You guys are
great.
Cheers,
Josh Roll
Lane Council of Governments
Transportation Planner
541-682-2454
jroll at lcog.org
www.lcog.org
-----Original Message-----
From: Phil Spector [mailto:spector at stat.berkeley.edu]
Sent: Monday, November 29, 2010 12:58 PM
To: ROLL Josh F
Cc: r-help at r-project.org
Subject: Re: [R] List elements of NULL to value
Does
A = lapply(A,function(x)if is.null(x) 0 else x) or
for(i in 1:length(A))if(is.null(A[[i]]))A[i] = 0
do what you want?
- Phil Spector
Statistical Computing Facility
Department of Statistics
UC Berkeley
spector at stat.berkeley.edu
On Mon, 29 Nov 2010, LCOG1 wrote:
>
> Hi everyone,
> I am posting this because i know its easy and i cant for the life
> of me figure out how to do it though i have tried and through a
> ridiculously complex loop made it happen. I need to convert some list
> elements of NULL value to 0s so they mesh with my data frame properly.
> So for
>
> A<-list(1,NULL)
>
> returns
>
> [[1]]
> [1] 1
>
> [[2]]
> NULL
>
> Would instead return
>
> [[1]]
> [1] 1
>
> [[2]]
> [1] 0
>
> The nabble posts seem to indicate dealing with NULLs can be tricky so
> i am attributing my lack of success to that, mainly so i can live with
> myself and asking the list such a simple question. Sorry again guys.
>
> JR
> --
> View this message in context:
> http://r.789695.n4.nabble.com/List-elements-of-NULL-to-value-tp3064384
> p3064384.html Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help at r-project.org mailing list
> 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.
>