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module-LinearAlgebra.SparseMatrix.html
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<h1 class="page-title">Class: SparseMatrix</h1>
<section>
<header>
<h2>
<span class="ancestors"><a href="module-LinearAlgebra.html">LinearAlgebra</a>.</span>
SparseMatrix
</h2>
</header>
<article>
<div class="container-overview">
<hr>
<dt>
<h4 class="name" id="SparseMatrix"><span class="type-signature"></span>new SparseMatrix()</h4>
</dt>
<dd>
<div class="description">
<p>This class represents a m by n real matrix where only nonzero entries<br>
are stored explicitly. Do not create a SparseMatrix from its constructor,<br>
instead use static factory methods such as fromTriplet, identity and diag.</p>
</div>
<dl class="details">
</dl>
<h5>Example</h5>
<pre class="sunlight-highlight-javascript">let T = new Triplet(100, 100);
T.addEntry(3.4, 11, 43);
T.addEntry(6.4, 99, 99);
let A = SparseMatrix.fromTriplet(T);
let B = SparseMatrix.identity(10, 10);
let d = DenseMatrix.ones(100, 1);
let C = SparseMatrix.diag(d);</pre>
</dd>
</div>
<h3 class="subsection-title">Methods</h3>
<dl>
<hr>
<dt>
<h4 class="name" id=".fromTriplet"><span class="type-signature"><static> </span>fromTriplet(T)</h4>
</dt>
<dd>
<div class="description">
<p>Initializes a sparse matrix from a <a href="module-LinearAlgebra.Triplet.html">Triplet</a> object.</p>
</div>
<h5>Parameters:</h5>
<table class="params table table-striped">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>T</code></td>
<td class="type">
<span class="param-type"><a href="module-LinearAlgebra.Triplet.html">module:LinearAlgebra.Triplet</a></span>
</td>
<td class="description last"><p>A triplet object containing only the nonzero entries that<br>
need to be stored in this sparse matrix.</p></td>
</tr>
</tbody>
</table>
<dl class="details">
</dl>
<h5>Returns:</h5>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type"><a href="module-LinearAlgebra.SparseMatrix.html">module:LinearAlgebra.SparseMatrix</a></span>
</dd>
</dl>
</dd>
<hr>
<dt>
<h4 class="name" id=".identity"><span class="type-signature"><static> </span>identity(m, n)</h4>
</dt>
<dd>
<div class="description">
<p>Initializes a m by n sparse identity matrix.</p>
</div>
<h5>Parameters:</h5>
<table class="params table table-striped">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>m</code></td>
<td class="type">
<span class="param-type">number</span>
</td>
<td class="description last"><p>The number of rows in this sparse matrix.</p></td>
</tr>
<tr>
<td class="name"><code>n</code></td>
<td class="type">
<span class="param-type">number</span>
</td>
<td class="description last"><p>The number of columns in this sparse matrix.</p></td>
</tr>
</tbody>
</table>
<dl class="details">
</dl>
<h5>Returns:</h5>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type"><a href="module-LinearAlgebra.SparseMatrix.html">module:LinearAlgebra.SparseMatrix</a></span>
</dd>
</dl>
</dd>
<hr>
<dt>
<h4 class="name" id=".diag"><span class="type-signature"><static> </span>diag(d)</h4>
</dt>
<dd>
<div class="description">
<p>Initializes a sparse diagonal matrix.</p>
</div>
<h5>Parameters:</h5>
<table class="params table table-striped">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>d</code></td>
<td class="type">
<span class="param-type"><a href="module-LinearAlgebra.DenseMatrix.html">module:LinearAlgebra.DenseMatrix</a></span>
</td>
<td class="description last"><p>The dense vector (d.nCols() == 1) used to initialize<br>
this sparse diagonal matrix.</p></td>
</tr>
</tbody>
</table>
<dl class="details">
</dl>
<h5>Returns:</h5>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type"><a href="module-LinearAlgebra.SparseMatrix.html">module:LinearAlgebra.SparseMatrix</a></span>
</dd>
</dl>
</dd>
<hr>
<dt>
<h4 class="name" id="transpose"><span class="type-signature"></span>transpose()</h4>
</dt>
<dd>
<div class="description">
<p>Returns the transpose of this sparse matrix.</p>
</div>
<dl class="details">
</dl>
<h5>Returns:</h5>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type"><a href="module-LinearAlgebra.SparseMatrix.html">module:LinearAlgebra.SparseMatrix</a></span>
</dd>
</dl>
</dd>
<hr>
<dt>
<h4 class="name" id="invertDiagonal"><span class="type-signature"></span>invertDiagonal()</h4>
</dt>
<dd>
<div class="description">
<p>Returns the inverse of this diagonal sparse matrix.</p>
</div>
<dl class="details">
</dl>
<h5>Returns:</h5>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type"><a href="module-LinearAlgebra.SparseMatrix.html">module:LinearAlgebra.SparseMatrix</a></span>
</dd>
</dl>
</dd>
<hr>
<dt>
<h4 class="name" id="nRows"><span class="type-signature"></span>nRows()</h4>
</dt>
<dd>
<div class="description">
<p>Returns the number of rows in this sparse matrix.</p>
</div>
<dl class="details">
</dl>
<h5>Returns:</h5>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">number</span>
</dd>
</dl>
</dd>
<hr>
<dt>
<h4 class="name" id="nCols"><span class="type-signature"></span>nCols()</h4>
</dt>
<dd>
<div class="description">
<p>Returns the number of columns in this sparse matrix.</p>
</div>
<dl class="details">