sparse_threshold

Source: tests/sparse/threshold.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/dense/Matrix.h>
#include <myramath/dense/MatrixRange.h>
#include <myramath/sparse/SparseMatrix.h>
#include <myramath/sparse/SparseMatrixRange.h>

// Algorithms.
#include <myramath/sparse/frobenius.h>
#include <myramath/sparse/threshold.h>

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

using namespace myra;

namespace {

template<class Number> void test(int I, int J, int N, typename ReflectPrecision<Number>::type tolerance)
  {
  myra::out() << typestring<Number>() << std::endl;
  // Make random A.
  auto A = SparseMatrix<Number>::random(I,J,N);
  // Make a dense Matrix from A, then threshold it back to a SparseMatrix.
  auto B = dense2sparse_threshold(A.make_Matrix());
  // Verify A == B
  typedef typename ReflectPrecision<Number>::type Precision;
  Precision error = frobenius(A-B);
  myra::out() << "  |A-threshold(A.make_Matrix())| = " << error << std::endl;
  REQUIRE(error < tolerance);
  }

} // namespace

ADD_TEST("sparse_threshold","[sparse]")
  {
  test<NumberS>(15,10,40,1.0e-4f);
  test<NumberD>(15,10,40,1.0e-9);
  test<NumberC>(15,10,40,1.0e-4f);
  test<NumberZ>(15,10,40,1.0e-9);  
  }

Results: [PASS]

float
  |A-threshold(A.make_Matrix())| = 0
double
  |A-threshold(A.make_Matrix())| = 0
std::complex<float>
  |A-threshold(A.make_Matrix())| = 0
std::complex<double>
  |A-threshold(A.make_Matrix())| = 0

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