How to replace a column vector in matrix

278 次查看（过去 30 天）
Danny Maefengea
Danny Maefengea 2020-8-28
评论： Phuwanut Pataratawinun 2022-3-6
A = [1 -4 1;4 -1 2;2 2 -3]
B = [6;-1;-20]
I want to replace part of matrx A i.e (1 -4 1) with B.
How can I do this?
Thank you for your help.
  2 个评论
Stephen23
Stephen23 2020-8-28
"How can I do this? "
Basic indexing (just the the introductory tutorials show):
>> A = [1,-4,1;4,-1,2;2,2,-3]
A =
1 -4 1
4 -1 2
2 2 -3
>> B = [6;-1;-20];
>> A(1,:) = B
A =
6 -1 -20
4 -1 2
2 2 -3
kelly lim
kelly lim 2021-12-3
how do you set the name of the new matrix , instead of A can you change it to Ax without changing the name of the original matrix. Please demosntrate thank you

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Sara Boznik
Sara Boznik 2020-8-28
A = [1 -4 1;4 -1 2;2 2 -3]
B = [6;-1;-20]
B=B'
A(1,:)=B'
  4 个评论
显示 2更早的评论
kelly lim
kelly lim 2021-12-3
how do you set the name of the new matrix , instead of A can you change it to Ax without changing the name of the original matrix. Please demosntrate thank you
Phuwanut Pataratawinun
Phuwanut Pataratawinun 2022-3-6
If you want changed matrix Ax without changing matrix A, just copy the contents of matrix A over to a new matrix Ax, then do the same replacement.
A = [1 -4 1;4 -1 2;2 2 -3]
B = [6;-1;-20]
B = B'
Ax = A
Ax(1,:) = B'

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Matrices and Arrays 的更多信息

标签

产品


版本

R2020a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by