dsymmLower

Source: tests/dense/symm3.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>
#include <myramath/dense/LowerMatrix.h>
#include <myramath/dense/LowerMatrixRange.h>

// Algorithms.
#include <myramath/utility/random.h>
#include <myramath/dense/gemm.h>
#include <myramath/dense/symm.h>
#include <myramath/dense/tril.h>
#include <myramath/dense/transpose.h>
#include <myramath/dense/frobenius.h>

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

using namespace myra;

namespace {

template<class Number> void test(int I, int J, typename ReflectPrecision<Number>::type tolerance)
  {  
  typedef typename ReflectPrecision<Number>::type Precision;
  myra::out() << typestring<Number>() << std::endl;
  // Make random symmetric matrix A.
  auto A = Matrix<Number>::random(I,I);
  A = A + transpose(A);
  Number alpha = random<Number>();
  Number beta  = random<Number>();
  // Extract A into LowerMatrix
  LowerMatrix<Number> L(tril(A));
  // Check symm('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);
    symm_inplace('L', C2, L, B, alpha, beta);
    Precision error = frobenius(C1-C2);
    myra::out() << "  |symm('L')-gemm()| = " << error << std::endl;
    REQUIRE(error < tolerance);
    }
  // Check symm('R')
    {
    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);
    symm_inplace('R', C2, L, B, alpha, beta);
    Precision error = frobenius(C1-C2);
    myra::out() << "  |symm('R')-gemm()| = " << error << std::endl;
    REQUIRE(error < tolerance);
    }
  }

} // namespace

ADD_TEST("ssymmLower","[dense][blas]")
  { test<NumberS>(51,32, 1.0e-4f); }

ADD_TEST("dsymmLower","[dense][blas]")
  { test<NumberD>(51,32, 1.0e-8); }

ADD_TEST("csymmLower","[dense][blas]")
  { test<NumberC>(51,32, 1.0e-4f); }

ADD_TEST("zsymmLower","[dense][blas]")
  { test<NumberZ>(51,32, 1.0e-8); }

Results: [PASS]

double
  |symm('L')-gemm()| = 3.66206e-15
  |symm('R')-gemm()| = 4.77173e-15

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