On Jul 12, 2010, at 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.
You will advance in your understanding faster if you adopt the correct
terminology:
-1+2*c(1,1,0)+2+c(-1,10,-1) returns c(2,13,0) but
... which is NOT a list, it is a vector.
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.
If you want a running cumulative mean of a vector, i.e,
c( mean(vec[1]), mean(vec[1:2]), ,,, mean(vec) ):
vec <- sample(1:20)
sapply(1:length(vec), function(x) mean(vec[1:x])
So, how to mean/min a list of lists and numbers to return a list?
Not a list and not working on "a list of lists". A vector.
--
David Winsemius, MD
West Hartford, CT
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