[R] Unlisting while preserving object types?

[Jacob W. Bowers]

Hi Jason,

How about this:

zz.spec<-lapply(zz,FUN=function(x){
spectrum(x,plot=F)
})

yourmatrix<-cbind(zz.spec$a$spec,zz.spec$b$spec)

Best,
Jake

On Wed, 10 Oct 2001, Turner, Jason wrote:

> Hi
> 
> A toy example is probably the least ambiguous way of explaining what I'm
> trying to do.
> 
> > library(ts)
> > zz<-list(a=rnorm(100),b=rt(100,3))
> > zz.spec<-lapply(zz,spectrum,plot=F)
> > summary(zz.spec)
>   Length Class Mode
> a 15     spec  list
> b 15     spec  list
> 
> I'm looking for an elegant way to fetch components of the sub-lists a and b
> of zz.spec; 
> e.g. to make a matrix with columns a$spec and b$spec.  
> 
> matrix(unlist(lapply(zz.spec,function(x){return(x$spec)})),ncol=length(zz.sp
> ec))
> 
> is about the best I've come up with.  Is there a more direct way?  This gets
> particularly
> important with nested sub-lists - lists of lists of lists.  Is the best
> approach is to 
> have the good sense to avoid such structures in the first place?
> 
> Cheers
> 
> Jason
> 
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