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https://github.com/NVIDIA/cuda-samples.git
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70 lines
2.8 KiB
C++
70 lines
2.8 KiB
C++
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/* Copyright (c) 2021, NVIDIA CORPORATION. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of NVIDIA CORPORATION nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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//! includes, system
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#include <cmath>
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#include <iostream>
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#include <iomanip>
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#include <vector>
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#include <cassert>
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#include <fstream>
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#include <algorithm>
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#include <map>
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// includes, projcet
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#include "matlab.h"
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// namespace, unnamed
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namespace {} // end namespace, unnamed
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///////////////////////////////////////////////////////////////////////////////
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//! Write a tridiagonal, symmetric matrix in vector representation and
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//! it's eigenvalues
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//! @param filename name of output file
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//! @param d diagonal entries of the matrix
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//! @param s superdiagonal entries of the matrix (len = n - 1)
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//! @param eigenvals eigenvalues of the matrix
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//! @param indices vector of len n containing the position of the eigenvalues
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//! if these are sorted in ascending order
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//! @param n size of the matrix
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///////////////////////////////////////////////////////////////////////////////
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void writeTridiagSymMatlab(const char *filename, float *d, float *s,
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float *eigenvals, const unsigned int n) {
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std::ofstream file(filename, std::ios::out);
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// write diagonal entries
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writeVectorMatlab(file, "d", d, n);
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// write superdiagonal entries
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writeVectorMatlab(file, "s", s, n - 1);
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// write eigenvalues
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writeVectorMatlab(file, "eigvals", eigenvals, n);
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file.close();
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}
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