How to create vector which is linear combination of a matrix
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Hi,
I have my matrix M as:
M = [1,2,3; 4,5,6; 7,8,9];
I am trying to create a vector that is a linear combination of the columns of M. I am doing it this way:
vec= [2*M(:,1); 3*M(:,2); 4*M(:,3)];
Its resulting in:
vec =
2
8
14
6
15
24
12
24
36
It doesn't seem right to me. Can you please help me in that? Any help will be really appreciated. Thanks in advance.
2 个评论
Karim
2022-8-30
You will need to expand a bit on why it doesn't seem right ... what would you expect as output?
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Chunru
2022-8-30
M = [1,2,3; 4,5,6; 7,8,9]
vec= sum([2*M(:,1) 3*M(:,2) 4*M(:,3)], 2)
% Alternatively
vec =M*[2; 3; 4]
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