determinant()

void ffpackInterface::determinant	(	const DMatZZpFFPACK &	A,
		ZZpFFPACK::ElementType &	result_det )

Note

1. matrix data (N) is modified by FFPACK

Definition at line 92 of file dmat.cpp.

{
  if (mat.numRows() == 0)
    {
      // 26 April 2014: this branch is needed as FFPACK gives answer of 0 in
      // this case.
      mat.ring().set_from_long(result_det, 1);
    }
  else
    {
      DMatZZpFFPACK N(mat);
      ZZpFFPACK::ElementType det = 0;
      result_det = FFPACK::Det(mat.ring().field(),
                               det,
                               mat.numRows(),
                               N.rowMajorArray(),
                               mat.numColumns());
    }
}

References DMatZZpFFPACK.

Referenced by DMatLinAlg< M2::ARingZZpFFPACK >::determinant().