作业帮n=[-10:9];x4=[1,0,1,2,3];xtilde=x4'*ones(1,4);xtilde=(xtilde(:))';subplot(2,2,4);stem(n,xtilde);xlabel('n');ylabel('x4(n)');axis([-10,9,-1,4])请问,xtilde=x4'*ones(1,4);xtilde=(xtilde(:))';怎么理解呢
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/06 07:49:13
![n=[-10:9];x4=[1,0,1,2,3];xtilde=x4'*ones(1,4);xtilde=(xtilde(:))';subplot(2,2,4);stem(n,xtilde);xlabel('n');ylabel('x4(n)');axis([-10,9,-1,4])请问,xtilde=x4'*ones(1,4);xtilde=(xtilde(:))';怎么理解呢](/uploads/image/z/9476048-56-8.jpg?t=n%3D%5B-10%3A9%5D%3Bx4%3D%5B1%2C0%2C1%2C2%2C3%5D%3Bxtilde%3Dx4%27%2Aones%281%2C4%29%3Bxtilde%3D%28xtilde%28%3A%29%29%27%3Bsubplot%282%2C2%2C4%29%3Bstem%28n%2Cxtilde%29%3Bxlabel%28%27n%27%29%3Bylabel%28%27x4%28n%29%27%29%3Baxis%28%5B-10%2C9%2C-1%2C4%5D%29%E8%AF%B7%E9%97%AE%2Cxtilde%3Dx4%27%2Aones%281%2C4%29%3Bxtilde%3D%28xtilde%28%3A%29%29%27%3B%E6%80%8E%E4%B9%88%E7%90%86%E8%A7%A3%E5%91%A2)
n=[-10:9];x4=[1,0,1,2,3];xtilde=x4'*ones(1,4);xtilde=(xtilde(:))';subplot(2,2,4);stem(n,xtilde);xlabel('n');ylabel('x4(n)');axis([-10,9,-1,4])请问,xtilde=x4'*ones(1,4);xtilde=(xtilde(:))';怎么理解呢
n=[-10:9];x4=[1,0,1,2,3];xtilde=x4'*ones(1,4);xtilde=(xtilde(:))';
subplot(2,2,4);stem(n,xtilde);xlabel('n');
ylabel('x4(n)');axis([-10,9,-1,4])
请问,xtilde=x4'*ones(1,4);xtilde=(xtilde(:))';怎么理解呢
n=[-10:9];x4=[1,0,1,2,3];xtilde=x4'*ones(1,4);xtilde=(xtilde(:))';subplot(2,2,4);stem(n,xtilde);xlabel('n');ylabel('x4(n)');axis([-10,9,-1,4])请问,xtilde=x4'*ones(1,4);xtilde=(xtilde(:))';怎么理解呢
xtilde=x4'*ones(1,4),是将x4转置变为一个列向量,再乘以一个一行4列的全1矩阵,这样会得到一个5行4列的矩阵
xtilde =
1 1 1 1
0 0 0 0
1 1 1 1
2 2 2 2
3 3 3 3
xtilde=(xtilde(:))'是将xtilde中的所有元素拉伸成一列,再转置为一行.
xtilde =
1 0 1 2 3 1 0 1 2 3 1 0 1 2 3 1 0 1 2 3