Create triangular matrix from vector

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Sib RV 2021-7-8

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/874468-create-triangular-matrix-from-vector

评论： Sib RV 2021-7-8

采纳的回答： KSSV

I have a vector, v = [x1, x2, x3 ....,xn]

I want to create a matrix from it in two ways: Upper triangular

x1 x2 x3.... xn

0 x2 x3 .... xn

0 0 x3 .....xn

. . . . . . ...

0 0 0 . . . . xn

Next, lower triangular:

x1 0 0 . .. 0

x1 x2 0 .... 0

. . . . .

x1 x2 .........xn

How can I do it without loops and conditional statements ?

Thank you.

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Scott MacKenzie 2021-7-8

This looks like a homework question. Have you tried any possible solutions? Please post what you have tried and ask a specific question about what you don't understand.

Sib RV 2021-7-8

It is already answered here. https://www.mathworks.com/matlabcentral/answers/114517-transforming-vector-into-triangular-matrix?s_tid=answers_rc1-1_p1_MLT

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