gusucode.com > cryptography_matlab_codes > cryptography_matlab_codes/convm.m
function X=convm(x,p); N = length(x)+2*p-2; x=x(:); xpad=[zeros(p-1,1);x;zeros(p-1,1)]; for k=1:p, X(:,k)=xpad(p-k+1:N-k+1); end