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sum of multiplication for a vector and matrix

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Abbi Hashem
Abbi Hashem on 27 Jun 2019
Edited: Bruno Luong on 27 Jun 2019
Say I have the following matrix and vector:
A = [ 2,3; 1,4] b= [ 5 , 7 ]
I want a code of the sum of the multiplication, such that each element of the matrix's first row are multiplied by the 1st cell of the vector, and the elements of the matrix's second row are multiplied by the 2nd cell of the vector, as follows:
2*5+3*5+1*7+4*7
( I will need this for a 1000*1000 matrix and a 1*1000 vector, but i used this example to clarify )

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Answers (2)

James Tursa
James Tursa on 27 Jun 2019
result = sum(b*A);

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Bruno Luong
Bruno Luong on 27 Jun 2019
Edited: Bruno Luong on 27 Jun 2019
b*sum(A,2)
Less operations than the first solution.

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