zhemmL

Source: tests/dense/hemm1.cpp

// ========================================================================= //
// This file is part of MyraMath, copyright (c) 2014-2019 by Ryan A Chilton  //
// and distributed by MyraCore, LLC. See LICENSE.txt for license terms.      //
// ========================================================================= //

// Containers.
#include <myramath/utility/Number.h>
#include <myramath/dense/Matrix.h>

// Algorithms.
#include <myramath/utility/random.h>
#include <myramath/dense/gemm.h>
#include <myramath/dense/hemm.h>
#include <myramath/dense/tril.h>
#include <myramath/dense/hermitian.h>
#include <myramath/dense/frobenius.h>

// Reporting.
#include <tests/myratest.h>

using namespace myra;

namespace {

template<class Precision> void test(int I, int J, Precision tolerance)
  {  
  typedef std::complex<Precision> Number;
  myra::out() << typestring<Number>() << std::endl;
  // Make random hermitian matrix A.
  auto A = Matrix<Number>::random(I,I);
  A = A + hermitian(A);
  Number alpha = random<Number>();
  Number beta  = random<Number>();
  // Extract lower triangle, fill upper triangle with random data.
  Matrix<Number> L = tril(A);
  for (int j = 0; j < I; ++j)
    for (int i = 0; i < j; ++i)
      L(i,j) = random<Number>();
  // Check hemm('L','L')
    {
    auto B  = Matrix<Number>::random(I,J);
    auto C1 = Matrix<Number>::random(I,J);
    Matrix<Number> C2 = C1;
    gemm_inplace(C1, A, 'N', B, 'N', alpha, beta);
    hemm_inplace('L', 'L', C2, L, B, alpha, beta);
    Precision error = frobenius(C1-C2);
    myra::out() << "  |hemm('L','L')-gemm()| = " << error << std::endl;
    REQUIRE(error < tolerance);
    }
  // Check hemm('R','L')
    {
    auto B  = Matrix<Number>::random(J,I);
    auto C1 = Matrix<Number>::random(J,I);
    Matrix<Number> C2 = C1;
    gemm_inplace(C1, B, 'N', A, 'N', alpha, beta);
    hemm_inplace('R', 'L', C2, L, B, alpha, beta);
    Precision error = frobenius(C1-C2);
    myra::out() << "  |hemm('R','L')-gemm()| = " << error << std::endl;
    REQUIRE(error < tolerance);
    }
  }

} // namespace

ADD_TEST("chemmL","[dense][blas]")
  { test<float> (53,28, 1.0e-4f); }

ADD_TEST("zhemmL","[dense][blas]")
  { test<double> (53,28, 1.0e-8); }

Results: [PASS]

std::complex<double>
  |hemm('L','L')-gemm()| = 1.24231e-13
  |hemm('R','L')-gemm()| = 1.2981e-13

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