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#ifndef __TSQR_Test_nodeTestProblem_hpp
#define __TSQR_Test_nodeTestProblem_hpp
#include <Tsqr_Random_MatrixGenerator.hpp>
#include <Teuchos_ScalarTraits.hpp>
#include <algorithm>
#include <vector>
namespace TSQR {
namespace Test {
/// Fill in the nrows by ncols matrix A (with leading dimension
/// lda) with a test problem for single-node TSQR.
template< class Ordinal, class Scalar, class Generator >
void
nodeTestProblem (Generator& generator,
const Ordinal nrows,
const Ordinal ncols,
Scalar A[],
const Ordinal lda,
const bool numerically_interesting)
{
typedef TSQR::Random::MatrixGenerator<Ordinal, Scalar, Generator> matgen_type;
typedef typename Teuchos::ScalarTraits<Scalar>::magnitudeType magnitude_type;
matgen_type matGen (generator);
if (numerically_interesting) {
std::vector<magnitude_type> singular_values (std::min (nrows, ncols));
singular_values[0] = magnitude_type (1);
for (Ordinal k = 1; k < std::min(nrows, ncols); ++k) {
singular_values[k] = singular_values[k-1] / magnitude_type(2);
}
matGen.fill_random_svd (nrows, ncols, A, lda, &singular_values[0]);
}
else {
matGen.fill_random (nrows, ncols, A, lda);
}
}
} // namespace Test
} // namespace TSQR
#endif // __TSQR_Test_nodeTestProblem_hpp
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