Hi I'm trying to sum functions of lists with different lengths. Here is a simplified example of the problem: r=list(1:3,1:5,1:2) r [[1]] [1] 1 2 3 [[2]] [1] 1 2 3 4 5 [[3]] [1] 1 2 x=function(i,j) sum(j*r[[i]]) # x is a function of two parameters: i & j y=function(j) # y is the sum of x over i + { + s=seq(from=1,to=3,by=1) + sum(x(s,j)) + }
y(1) Error in r[[i]] : recursive indexing failed at level 2 The error is clearly due to the lists; I actually tried this code with functions of vectors and scalars and it worked perfectly. I tried to use means of summing lists by recursion but it does not work with functions of lists, for e.g.: y=function(j) x(1,j) for(i in 2:3) + { + y=function(j) y(j)+x(i,j) + } y(1) Error: evaluation nested too deeply: infinite recursion / options(expressions=)? Is there a way to perform this summation? Thanks! H. [[alternative HTML version deleted]] ______________________________________________ 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.