How to replace a column vector in matrix
显示 更早的评论
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
2020-8-28
"How can I do this? "
>> 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
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
采纳的回答
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
James Tursa
2020-8-28
编辑：James Tursa
2020-8-28
You don't actually need to do any transposing. Just using B directly works, even though B is a column vector and you are assigning it to a row:
A(1,:) = B;
Danny Maefengea
2020-8-28
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
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'
更多回答（0 个）
类别
在 帮助中心 和 File Exchange 中查找有关 Matrices and Arrays 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
