Multiplies a matrix with another matrix that only has one column. - Java java.lang

Description

Multiplies a matrix with another matrix that only has one column.

Demo Code

//package com.java2s;

public class Main {
    /**//  w ww  .j a va2 s .  c om
     * Multiplies a matrix with another matrix that only  has one column.
     * @param mat The matrix (m x n).
     * @param vector The matrix that only contains one column. It is a
     * two-dimensional array, the parameter vectorCol determines which column
     * holds the vector.
     * @param vectorCol The column that holds the vector data.
     * @return The resulting matrix of size m x 1.
     */
    public static double[] matrix_x_vectorMatrix(double[][] mat,
            double[][] vector, int vectorCol) {

        final int m = mat.length;
        final int n = mat[0].length;

        double[] res = new double[m];

        for (int row = 0; row < m; row++) {
            for (int col = 0; col < n; col++) {
                res[col] += mat[row][col] * vector[col][vectorCol];
            }
        }

        return res;
    }
}

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