1、c = 2 3 4 5 n=(0:3); stem(n,c); stem(n,c,fill);2信号与标量的乘积ax(n) a=1 2 3 4; c=3*a 3 6 9 123两个信号相乘x1(n)*x2(n)和乘方an a=2 2 2 2;b=1 2 3 4; c=a.*b 2 4 6 84信号折叠x(-n):fliplrfunction y,n=sigfold(x,n)%y(n)=x(-n)y=fliplr(x);n=-fliplr(n);return x=1 2 3 4 5x = 1 2 3 4 5 n=0 1 2 3 4n = 0 1 2 3 4 y,n=sigfold(x,n)y =
2、 5 4 3 2 1-4 -3 -2 -1 0 m=(0:4); stem(m,y); stem(m,y, stem(m,n); stem(m,n,5信号的卷积 b=1 1 1 1 1; c=conv(a,b) 1 2 3 4 4 3 2 17);6length(x)函数 length(x)ans = 5 stem(n,x); stem(n,x,7课后题(1)15); x=0.8.n Columns 1 through 10 1.0000 0.8000 0.6400 0.5120 0.4096 0.3277 0.2621 0.2097 0.1678 0.1342 Columns 11 through 160.1074 0.0859 0.0687 0.0550 0.0440 0.0352(2) x1=-2 0 1 -1 3; x2=1 2 0 -1; x=conv(x1,x2) -2 -4 1 3 1 5 1 -3 stem(n,x1); stem(n,x1, stem(n,x2); stem(n,x2,