xlfz.m

the code of the book come form the book of marlix laboratory with the book of singal

function [x,n]=xlfz(x1,n1)
%绘制离散序列反褶信号波形
x=fliplr(x1);n=-fliplr(n1);               %调用fliplr函数实现反褶
stem(n,x,'filled')
axis([min(n)-1,max(n)+1, min(x)-0.5,max(x)+0.5])