On 12/07/2010 11:10 AM, g...@ucalgary.ca wrote:
I would like to sum/mean/min a list of lists and numbers to return the
related lists.
-1+2*c(1,1,0)+2+c(-1,10,-1) returns c(2,13,0) but
sum(1,2*c(1,1,0),2,c(-1,10,-1)) returns 15 not a list.
Using the suggestions of Gabor Grothendieck,
Reduce('+',list(-1,2*c(1,1,0),2,c(-1,10,-1))) returns what we want,
c(2,13,0).
However, it seems that this way does not work to mean/min.
So, how to mean/min a list of lists and numbers to return a list? Thanks,
You need to be careful of terminology: c(1,1,0) is not a list, it's a
vector. What you want is to apply functions componentwise to lists of
vectors.
One way to do that is to bind them into a matrix, and use apply. For
example:
M <- cbind(-1, c(1,1,0), c(-1,10,-1))
apply(M, 1, mean)
Duncan Murdoch
______________________________________________
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.
