cirshftt.m

matlab的一些基础程序

function [y]=cirshftt(x,m,N)

%[y]=cirshftt(x,m,N)
%y=output sequence containing the circular shift
%x=input sequence of length <=N
%m=sample shift 
%N=size of circular buffter
%method: y(n)=x((n-m)) mod N)
if length(x)>N 
   error('N must be >= the length of x')
end
x=[x zeros(1,N-length(x))]
n=[0:1:N-1]
n=mod(n-m,N)
y=x(n+1)