% create a large gaussian kernel
k = smoothkern(2000);
% convolve with a all-ones vector of equal length
tic, ko = convones(k, numel(k)); toc
% reference: Elapsed time is 0.024565 seconds.
% and now the same with conv
tic, koc = conv(k, ones(numel(k), 1)); toc
% reference: Elapsed time is 0.240042 seconds.