These 2 modifications work:
tbl = table(randn(5,1));
func = @(x) cumsum(x);
varfun(func, tbl)
% ans =
% 5x1 table
% Fun_Var1
% ________
% 0.53767
% 2.3716
% 0.11271
% 0.97488
% 1.2936
varfun(@(x) func(x), tbl)
I've (that is a major warning-flag!) have come to see this as func being a function handle, not the function itself function. varfun expects a function-handle, and I've come to see your construct:
varfun(@func, tbl)
as
varfun(@ @cumsum, tbl)
Which would be handle-function-handle or some such wrong-order type.
HTH
