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Could anyone please help me to do matrix multiplication with respect to the sample data given below.

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jaah navi
jaah navi on 21 Feb 2020
Answered: Sindar on 21 Feb 2020
If
A=[2 3 4]
B=A*[1;
2;
3]
so i want to multiply 2 with
[1;
2;
3]
followed by 3 with
[1;
2;
3]
finally 4 with
[1;
2;
3]
so at the end i need to have 3x3 matrix.

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Answers (1)

Sindar
Sindar on 21 Feb 2020
Matrix multiplication only works when the "middle" dimension matches ( N x M ) * ( M x O )
Check the sizes of your matrices:
>> size(A)
ans =
1 3
>> size([1;2;3])
ans =
3 1
So, A*([1;2;3]) is not valid, but ([1;2;3])*A is (and gives you what you want):
>> B = [1;2;3]*A
B =
2 3 4
4 6 8
6 9 12

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