gusucode.com > cryptography_matlab_codes > cryptography_matlab_codes/circmat.m
function X = circmat(v,m); % This function produces a circulant matrix of the type % that is used in the function lfsrlength v=v(:); % enforce v to be a column vector X=zeros(m,m); vln=length(v); if (vln < 2*m-1), error('The vector v needs to be atleast length 2m-1'); end for j=1:m, X(:,j)= v(j:m+j-1); %place data in appropriate columns end;