M文件:function u=y(n) m=0; u=0; while m<=n; m=m+1; u = u+x(m)*h(n-m);endfunction x1=x(n)if n>=0 & n<=127; x1=1;else x1=n-n;endfunction x2=h(n)if n>=0 & n<=63; x2=1;else x2=0;end例如输入:x=1:10;y(x)只得一个结果:2