matlabmatrixmultiplicationvector-multiplication

Matlab column multiplication of a matrix

How can I multiply columns of a matrix and obtain a column vector.

Example: A =

 1     1     4
 3     2     2
 2     1     1
 4     1     1

Expected output: C =

 4
12
 2
 4

Any ideas without for?

Solution

  • You can simply use the inbuilt prod function as prod(A,2) or prod(A')'.

    For example:

    >> 
A = [
1     1     4
3     2     2
2     1     1
4     1     1
];

    Now:

    >> prod(A,2)

ans =

    4
    12
    2
    4

    For more details, try help prod.