[R] subset list based on logical within element flag

[Srinivas Iyyer]

Hi I have the smililar question.

I have a list:
my_list <- list(name="Fred", wife="Mary",
no.children=3, child.ages=c(4,7,9)) 


> my_list
$name
[1] "Fred"

$wife
[1] "Mary"

$no.children
[1] 3

$child.ages
[1] 4 7 9


Now I want to search "Fred" and get attribute of that
value which is 'name'. 

how do I get it. 

> match(my_list,"Fred")
[1]  1 NA NA NA

my thinking stops right here... 

list operations in R is too tough to digest and there
is not good documentations. 

Could any one please help. 

thanks
Srini







--- Benilton Carvalho <bcarvalh at jhsph.edu> wrote:

> gene.pair.tf.lst[sapply(gene.pair.tf.lst, "[[",
> "sig.cor")]
> 
> b
> 
> 
> On Mar 12, 2008, at 5:24 PM, Mark W Kimpel wrote:
> 
> > I have a very long list that I'd like to subset
> based on a logical  
> > value
> > within each element. Example below. I'd like to
> get just those list
> > elements for further study whose $sig.cor slot is
> TRUE. In this  
> > example,
> > I'd only want element [[2]].
> >
> > Should be simple, I know. How can I do this?
> Thanks, Mark
> >
> >> gene.pair.tf.lst
> > [[1]]
> > [[1]]$gene.pair
> > [1] "Lgals1:Pxmp2"
> >
> > [[1]]$sig.cor
> > [1] FALSE
> >
> >
> > [[2]]
> > [[2]]$gene.pair
> > [1] "Lgals1:Pxmp2"
> >
> > [[2]]$sig.cor
> > [1] TRUE
> >
> >
> > [[3]]
> > [[3]]$gene.pair
> > [1] "Lgals1:Pxmp2"
> >
> > [[3]]$sig.cor
> > [1] FALSE
> > -- 
> >
> > Mark W. Kimpel MD  ** Neuroinformatics ** Dept. of
> Psychiatry
> > Indiana University School of Medicine
> >
> > 15032 Hunter Court, Westfield, IN  46074
> >
> > (317) 490-5129 Work, & Mobile & VoiceMail
> > (317) 204-4202 Home (no voice mail please)
> >
> > mwkimpel<at>gmail<dot>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.
> 
> > ______________________________________________
> 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.
>