samer@0: function [h,t]=split(dim,n,s)
samer@0: % split - gather first n elements and return with rest of sequence
samer@0: %
samer@0: % split :: D:natural, N:natural, seq A -> [[N]->A], seq A
samer@0: 
samer@0: h=[];
samer@0: for i=1:n, x=head(s); h=cat(dim,h,x); s=next(s); end
samer@0: t=s;
samer@0: 
samer@0: 	
samer@0: