public virtual void test_toString()
{
DoubleMatrix test = DoubleMatrix.copyOf(new double[][]
{
new double[] { 1d, 2d },
new double[] { 3d, 4d },
new double[] { 5d, 6d }
});
assertEquals(test.ToString(), "1.0 2.0\n3.0 4.0\n5.0 6.0\n");
}