Example usage for org.apache.commons.math.linear RealMatrix multiplyEntry

Introduction

In this page you can find the example usage for org.apache.commons.math.linear RealMatrix multiplyEntry.

Prototype

void multiplyEntry(int row, int column, double factor) throws MatrixIndexException;

Source Link

Document

Change an entry in the specified row and column.

Usage

From source file:org.mitre.math.linear.RealMatrixUtils.java

/**
 * Multiply a matrix by a scalar, C = s*A
 * @param s    scalar// w  w w.j  a  v a  2  s  .  c  om
 * @return     s*A
 */
public RealMatrix times(RealMatrix A, double s) {
    int m = A.getRowDimension();
    int n = A.getColumnDimension();
    RealMatrix C = getNewRealMatrix(m, n);
    //double[][] C = X.getArray();
    for (int i = 0; i < m; i++) {
        for (int j = 0; j < n; j++) {
            C.multiplyEntry(i, j, s);
            //C[i][j] = s*A[i][j];
        }
    }
    return C;
}

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From source file:org.mitre.math.linear.RealMatrixUtils.java

/**
 * Multiply a matrix by a scalar in place, A = s*A
 * @param s    scalar/* w  w w.j a v a 2 s  . co m*/
 * @return     replace A by s*A
 */
public void timesEquals(RealMatrix A, double s) {
    int m = A.getRowDimension();
    int n = A.getColumnDimension();
    for (int i = 0; i < m; i++) {
        for (int j = 0; j < n; j++) {
            //A[i][j] = s*A[i][j];
            A.multiplyEntry(i, j, s);
        }
    }
}

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