samer@4: % foldcols - fold from left combinator for columns of an array
samer@4: %
samer@4: % foldcols :; 
samer@4: %    (A,[[N]]->A) ~'folding function',
samer@4: %    A            ~'initial value',
samer@4: %    [[N,L]]      ~'data to scan, sequence of length L'
samer@4: % -> A.
samer@4: 
samer@12: function y=foldcols(f,y,X)
samer@12: 	for i=1:size(X,2), y=f(y,X(:,i)); end
samer@12: end
samer@4: 	
samer@4: