8-2.m

matlab要求编写函数

n=[0:25];
x2=mtimes(n,2).*(stepseq(-5,0,25)-stepseq(6,0,25))+10.*impseq(0,0,25)+20.*power(0.5,n).*(stepseq(4,0,25)-stepseq(10,0,25))
stem(n,x2)