alberto trivellato created MATH-1176:
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Summary: QRDecomposition does not detect the matrix singularity
Key: MATH-1176
URL: https://issues.apache.org/jira/browse/MATH-1176
Project: Commons Math
Issue Type: Bug
Affects Versions: 3.3
Reporter: alberto trivellato
Priority: Minor
QRDecomposition fails this test. The default contructor sets the threshold=0,
so we will never have abs(Rii) <= 0
public void testSimpleRankDeficient() throws Exception {
double[][] A = new double[][] {
{ 1, 2, 3 },
{ 4, 5, 6 },
{ 7, 8, 9 }};
//this matrix is singular
RealMatrix M2 = MatrixUtils.createRealMatrix(A);
QRDecomposition qr2 = new QRDecomposition(M2);
assertFalse(qr2.getSolver().isNonSingular());//this fails
}
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