Examples of com.opengamma.analytics.math.matrix.OGMatrixAlgebra.subtract()

    final double chiSqDoF = res.getChiSq() / 16;
    assertTrue(chiSqDoF > 0.25);
    assertTrue(chiSqDoF < 3.0);


    final DoubleMatrix1D trueValues = new DoubleMatrix1D(new double[] {1, 1, 0, 0 });
    final DoubleMatrix1D delta = (DoubleMatrix1D) ma.subtract(res.getFitParameters(), trueValues);


    final LUDecompositionCommons decmp = new LUDecompositionCommons();
    final LUDecompositionResult decmpRes = decmp.evaluate(res.getCovariance());
    final DoubleMatrix2D invCovariance = decmpRes.solve(DoubleMatrixUtils.getIdentityMatrix2D(4));

    // System.out.println("delta parms: " + deltaParms);


    final DoubleMatrix1D y = (DoubleMatrix1D) ma.add(Y, deltaY);


    final LeastSquareResults lsRes = ls.solve(X, y, SIGMA, PARAM_FUNCTION, PARAM_GRAD, solution);
    final DoubleMatrix1D trueDeltaParms = (DoubleMatrix1D) ma.subtract(lsRes.getFitParameters(), solution);
    // System.out.println("true delta parms: " + trueDeltaParms);


    assertEquals(trueDeltaParms.getEntry(0), deltaParms.getEntry(0), 5e-5);
    assertEquals(trueDeltaParms.getEntry(1), deltaParms.getEntry(1), 5e-5);
    assertEquals(trueDeltaParms.getEntry(2), deltaParms.getEntry(2), 5e-5);

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