/**
* See if passing in a matrix or not providing one to getQ and getR functions has the same result
*/
@Test
public void checkGetNullVersusNot() {
int width = 5;
int height = 10;
QRDecomposition<DenseMatrix64F> alg = createQRDecomposition();
SimpleMatrix A = new SimpleMatrix(height, width);
RandomMatrices.setRandom(A.getMatrix(), rand);
alg.decompose(A.getMatrix());
// get the results from a provided matrix
DenseMatrix64F Q_provided = RandomMatrices.createRandom(height, height, rand);
DenseMatrix64F R_provided = RandomMatrices.createRandom(height, width, rand);
assertTrue(R_provided == alg.getR(R_provided, false));
assertTrue(Q_provided == alg.getQ(Q_provided, false));
// get the results when no matrix is provided
DenseMatrix64F Q_null = alg.getQ(null, false);
DenseMatrix64F R_null = alg.getR(null, false);
// see if they are the same
assertTrue(MatrixFeatures.isEquals(Q_provided, Q_null));
assertTrue(MatrixFeatures.isEquals(R_provided, R_null));
}
private void checkDecomposition(int height, int width, boolean compact) {
QRDecomposition<DenseMatrix64F> alg = createQRDecomposition();
SimpleMatrix A = new SimpleMatrix(height, width);
RandomMatrices.setRandom(A.getMatrix(), rand);
assertTrue(alg.decompose(A.copy().getMatrix()));
int minStride = Math.min(height, width);
SimpleMatrix Q = new SimpleMatrix(height, compact ? minStride : height);
alg.getQ(Q.getMatrix(), compact);
SimpleMatrix R = new SimpleMatrix(compact ? minStride : height, width);
alg.getR(R.getMatrix(), compact);
// see if Q has the expected properties
assertTrue(MatrixFeatures.isOrthogonal(Q.getMatrix(), 1e-6));
// UtilEjml.print(alg.getQR());
// Q.print();
// R.print();
// see if it has the expected properties
DenseMatrix64F A_found = Q.mult(R).getMatrix();
EjmlUnitTests.assertEquals(A.getMatrix(), A_found, 1e-6);
assertTrue(Q.transpose().mult(A).isIdentical(R, 1e-6));
}
/** Depending on if setZero being true or not the size of the R matrix changes */
@Test
public void checkGetRInputSize() {
int width = 5;
int height = 10;
QRDecomposition<DenseMatrix64F> alg = createQRDecomposition();
SimpleMatrix A = new SimpleMatrix(height, width);
RandomMatrices.setRandom(A.getMatrix(), rand);
alg.decompose(A.getMatrix());
// check the case where it creates the matrix first
assertTrue(alg.getR(null, true).numRows == width);
assertTrue(alg.getR(null, false).numRows == height);
// check the case where a matrix is provided
alg.getR(new DenseMatrix64F(width, width), true);
alg.getR(new DenseMatrix64F(height, width), false);
// check some negative cases
try {
alg.getR(new DenseMatrix64F(height, width), true);
fail("Should have thrown an exception");
} catch (IllegalArgumentException e) {
}
try {
alg.getR(new DenseMatrix64F(width - 1, width), false);
fail("Should have thrown an exception");
} catch (IllegalArgumentException e) {
}
}