[MATH-910] "ebe..." basic operations in "MathArrays"

• Type: New Feature
• Status: Closed
• Priority: Trivial
• Resolution: Fixed
• Fix Version/s: 3.1
• Assignee: Gilles Sadowski
• Reporter: Gilles Sadowski
• Created: 27/Nov/12 16:28
• Updated: 04/Mar/13 18:53
• Resolved: 27/Nov/12 22:20

Description

I propose to add element-by-element addition, subtraction, division and multiplication in the "MathArrays" class. E.g. "ebeDivide" would be defined as:

    /**
     * Creates an array whose contents will be the element-by-element
     * division of the first argument by the second.
     *
     * @param numer Numerator of the division.
     * @param denom Denominator of the division.
     * @return a new array {@code r} where {@code r[i] = numer[i] / denom[i]}.
     * @throws DimensionMismatchException if the array lengths differ.
     */
    public static double[] ebeDivide(double[] numer,
                                     double[] denom) {
        if (numer.length != denom.length) {
            throw new DimensionMismatchException(numer.length, denom.length);
        }

        final double[] result = numer.clone();
        for (int i = 0; i < numer.length; i++) {
            result[i] /= denom[i];
        }
        return result;
    }

This would allow to resolve MATH-895 without settling the discussion on how the API of RealVector should change.