public virtual void test_map()
        {
            double[][] @base = new double[][]
            {
                new double[] { 1d, 2d },
                new double[] { 3d, 4d },
                new double[] { 5d, 6d }
            };
            DoubleMatrix test = DoubleMatrix.copyOf(@base);

            assertMatrix(test.map(v => 1 / v), 1d, 1d / 2d, 1d / 3d, 1d / 4d, 1d / 5d, 1d / 6d);
        }