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How to replace a column vector in matrix

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Danny Maefengea
Danny Maefengea on 28 Aug 2020
Commented: Stephen on 28 Aug 2020
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.
  1 Comment
Stephen
Stephen on 28 Aug 2020
"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

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Accepted Answer

Sara Boznik
Sara Boznik on 28 Aug 2020
A = [1 -4 1;4 -1 2;2 2 -3]
B = [6;-1;-20]
B=B'
A(1,:)=B'
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