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How to replace a column vector in matrix

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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

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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
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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'

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