How can i index a matrix to do implicit multiplication to each value in a row with a vector?

Question

Liz Cowling 2019-9-21

0
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https://ww2.mathworks.cn/matlabcentral/answers/481424-how-can-i-index-a-matrix-to-do-implicit-multiplication-to-each-value-in-a-row-with-a-vector

评论： Stephen23 2019-9-21

I have a matrix, A of size (a x b) and a vector s of size (1 x b) and I want to multiply each row of A with s.

I am trying to use a for loop to index each of the 'a' rows of matrix A and then index along the 'b' columns and multiply each value with the corresponding index of vecor s. This should then return a new matrix B that is the same size as matrix A, however I cannot get this to work. This is my code;

A = rand(8,3);

s = rand(1,3);

for i = 1:size(A,1)

c = A(i,:);

for ii = 1:size(A,2)

x(ii) = c(ii)*s(ii);

end

Please note: I do not want to simply multiply the two together, I am aware that i can transpose and get a resulting a x 1 size vector - this is not the solution I want to achieve.