matrix multiplication with factor of array matlab

Question

Have matrix A that have size x by y and matrix B with x by 1

in matrix B have an element that represent kind of co factor that correspondent with matrix A I want the program A * B ( A * factor of each array )

Example

A (4 * 3) = [ 2 4 6 ; 5 10 15 ; 7 11 13 ; 1 1 1]; B (4 * 1) = [ 4 ; 1/5 ; 3 ; 7]; I want A * B like [ 2*4 , 4*4 , 6*4 ;5/5 , 10/5 , 15/5 ;7*3 , 11*3 , 13*3 ;1*7 , 1*7 , 1*7]; expected RESULT = [ 8 16 24 ; 1 2 3 ; 21 33 39 ; 7 7 7];

I try to use scalar multiplication but it didn't work since scalar multiplication must have same size of array how do I to solve this?

@Divakar You can post it as an answer so that OP can accept it. :P — herohuyongtao
– herohuyongtao, Commented Mar 20, 2014 at 5:27
possible duplicate of Element wise multiplication of every row/column of a matrix with a vector — Robert Seifert
– Robert Seifert, Commented Mar 20, 2014 at 11:15

Divakar · Accepted Answer · 2014-03-20 05:51:13Z

1

Use bsxfun to get your desired result of multiplying the row elements of A with the single row value in B

bsxfun(@times,A,B)

answered Mar 20, 2014 at 5:51

Divakar

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