sigshft.m

实现:实指数、复指数、不同长度序列求和、y(n)=x(-n)、y(n)=x(n-k)

function [y,n]=sigshft(x,m,n0)
%y(n)=x(n-n0),m is the length of x
if n0>=0 
    n=0:m+n0-1;
else 
    n=n0:m+n0-1;
end;
y=[zeros(1,n0) x];