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dbff
2012 Nov 08
4
Accessing selected elements of a list
Hi,
If I have a vector:
junk <- c(2,0,0,3,0)
and want to access, say, all the elements that are greater than zero. I just do:
junk[which(junk>0)]
Now, If I have a list:
jlist <- list(NULL,c(1,0),NULL,c(1,2,3), NULL)
and want to access all the elements that have length greater than zero, I know how to find the elements with:
which(sapply(jlist,length)>0)
But how do I get a