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172 lines
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11 KiB
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<a href="https://numerics.mathdotnet.com">Math.NET Numerics</a> |
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<a href="https://www.mathdotnet.com">Math.NET Project</a> |
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<a href="https://github.com/mathnet/mathnet-numerics">GitHub</a>
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<h1><a name="NIST-MatrixMarket-Text-Files" class="anchor" href="#NIST-MatrixMarket-Text-Files">NIST MatrixMarket Text Files</a></h1>
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<p>MatrixMarket is both a <a href="https://math.nist.gov/MatrixMarket/">vast repository of test data</a>
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and a text-based <a href="https://math.nist.gov/MatrixMarket/formats.html">exchange file format</a> provided by NIST.
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Being text-based makes it convenient to deal with and program against, and also works well with versioning
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tools like <a href="https://www.git-scm.com/">Git</a>. But other than <a href="CSV.html">CSV</a> it can also store sparse matrices in a compact way.</p>
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<p>Math.NET Numerics provides basic support for MatrixMarket files with the <strong>MathNet.Numerics.Data.Text</strong> package,
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which is available on NuGet as separate package and not included in the basic distribution.</p>
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<h2><a name="Reading-a-matrix-from-a-MatrixMarket-file" class="anchor" href="#Reading-a-matrix-from-a-MatrixMarket-file">Reading a matrix from a MatrixMarket file</a></h2>
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<p>The <code>MatrixMarketReader</code> class provides static functions to read a matrix or a vector from a file or string.
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It can read from:</p>
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<ul>
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<li>
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<strong>TextReader</strong>: If you have your delimited data already in memory in a string,
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you can use this method using a StringReader.
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</li>
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<li><strong>Stream</strong>: read directly from a stream, e.g. a MemoryStream, FileStream or NetworkStream.</li>
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<li><strong>File Path (string)</strong>: read from a file, specified by the file system path. Optionally GZip compressed.</li>
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</ul>
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<p>All these functions expect the data type of the matrix to be generated as generic type argument.
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Only Double, Single, Complex and Complex32 are supported.</p>
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<p>Example:</p>
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<table class="pre"><tr><td class="snippet"><pre class="fssnip highlighted"><code lang="csharp"><span class="k">using</span> MathNet.Numerics.Data.Text;
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Matrix<<span class="k">double</span>> matrix <span class="o">=</span> MatrixMarketReader.ReadMatrix<<span class="k">double</span>>(<span class="s">"fidap007.mtx"</span>);
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</code></pre></td></tr></table>
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<h2><a name="Writing-a-matrix-to-a-MatrixMarket-file" class="anchor" href="#Writing-a-matrix-to-a-MatrixMarket-file">Writing a matrix to a MatrixMarket file</a></h2>
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<p>The dual to the reader above is the <code>MatrixMarketWriter</code> class that can serialize a matrix or vector
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to a MatrixMarket text file, stream or TextWriter.</p>
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<p>Example:</p>
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<table class="pre"><tr><td class="snippet"><pre class="fssnip highlighted"><code lang="csharp">MatrixMarketWriter.WriteMatrix(<span class="s">"matrix.mtx"</span>, m);
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</code></pre></td></tr></table>
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<h2><a name="Alternatives" class="anchor" href="#Alternatives">Alternatives</a></h2>
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<p>The data extension packages also offer other ways to serialize a matrix to a binary stream or file.
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Among others:</p>
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<ul>
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<li><a href="CSV.html">Delimited Text Files (CSV & TSV)</a></li>
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<li><a href="MatlabFiles.html">MATLAB Level-5 Mat files</a></li>
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