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Q-Matrix.html
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<!DOCTYPE html>
<html>
<head>
<title>Q ⟩ Matrix</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1.0">
<meta name="description" content="Quantum computing in your browser.">
<meta name="copyright" content="Stewart Smith 2019–2020">
<meta name="keywords" content="
Q, Q.js, Q-js, Qjs, quantum JavaScript,
quantum, quantum physics, quantum mechanics, superposition,
quantum computer, quantum computer programming, quantum computing, QC,
quantum simulator, quantum computer simulator,
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Web, Web site, website, Web browser, browser, HTML, HTML5, JavaScript, ES6, CSS,
Chrome, Firefox, Safari, Opera, Brave, Edge, WebKit, Blink, Gecko, Mozilla,
Stewart Smith, Stewart, Stew, Stuart, Steven, Steve, Stewdio, stewartsmith, stew_rtsmith, @stew_rtsmith,
Moar, Moar Technologies Corp, MTC,
Google, IBM, Microsoft, Amazon, NASA, DWave, D-Wave,
Quil, OpenQASM,
ProjectQ, Qiskit,
Quantum Development Kit, Cirq, Strawberry Fields, t|ket>,
QCL, Quantum pseudocode, Q#, Q|SI>, Q language, qGCL, QFC, QML, LIQUi|>, Quipper,
Stanford CS 269 Q: Quantum Computer Programming">
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<meta property="og:url" content="https://quantumjavascript.app/Matrix.html">
<link rel="canonical" href="https://quantumjavascript.app/Matrix.html">
<link href="assets/Q-favicon-064.png" rel="icon" type="image/png">
<link href="assets/Q-favicon-144.png" rel="apple-touch-icon">
<link rel="stylesheet" href="Q/Q.css">
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<link rel="stylesheet" href="assets/documentation.css">
<script src="https://www.googletagmanager.com/gtag/js" async></script>
<script src="assets/ga.js"></script>
<script src="Q/Q.js"></script>
<script src="Q/Q-ComplexNumber.js"></script>
<script src="Q/Q-Matrix.js"></script>
<script src="Q/Q-Qubit.js"></script>
<script src="Q/Q-Gate.js"></script>
<script src="Q/Q-History.js"></script>
<script src="Q/Q-Circuit.js"></script>
<script src="Q/Q-Circuit-Editor.js"></script>
<script src="assets/navigation.js"></script>
</head>
<body>
<main class="api">
<p>
Source code:
<a href="https://github.com/stewdio/q.js/blob/master/source/Q-Matrix.js?ts=4" target="_blank">
<code>Q-Matrix.js</code>
</a>
</p>
<hr>
<h3>Grid of numbers</h3>
<p>
A <a href="https://en.wikipedia.org/wiki/Matrix_(mathematics)" target="_blank">matrix</a>
is just a grid of numbers; rows and columns containing values.
Matrices can be of any size.
Here’s an example of a 3 × 2 matrix.
It is 3 columns wide and 2 rows tall,
containing the values 1 through 6.
</p>
<br>
<div class="maths center">
<div class="matrix">
<div class="matrix-bracket-left"></div>
<div class="matrix-bracket-right"></div>
<table id="rows-and-columns-3x2">
<tr>
<td>1</td><td>2</td><td>3</td>
</tr>
<tr>
<td>4</td><td>5</td><td>6</td>
</tr>
</table>
</div>
</div>
<br>
<p>
When describing the dimensions of a matrix
we always specify the number of rows first,
then the number of columns.
The above is an example of a 3 × 2 matrix,
while below is a matrix containing similar data, but in a 2 × 3 configuration.
</p>
<div class="maths center">
<div class="matrix">
<div class="matrix-bracket-left"></div>
<div class="matrix-bracket-right"></div>
<table id="rows-and-columns-2x3">
<tr>
<td>1</td><td>2</td>
</tr>
<tr>
<td>3</td><td>4</td>
</tr>
<tr>
<td>5</td><td>6</td>
</tr>
</table>
</div>
</div>
<h4>Order matters</h4>
<p>
Q thinks about matrices in
<a href="https://en.wikipedia.org/wiki/Row-_and_column-major_order" target="_blank"><strong>row-major</strong> order</a>.
This means we read the values just as they are ordered above,
starting with the top-most row, reading values from left to right,
then proceeding to the next row down and repeating that process.
Our choice of row-major order makes reading and writing matrix values
more akin to reading and writing in English;
easier to type and program here.
<!-- To illustrate the difference, here’s an example of a 3 × 2 matrix in <strong>column-major</strong> order. -->
</p>
<br>
<div class="maths center">
<table>
<tr>
<td>
<div class="matrix" id="row-major-3x2">
<div class="matrix-bracket-left"></div>
<div class="matrix-bracket-right"></div>
<table>
<tr>
<td>1</td><td>2</td><td>3</td>
</tr>
<tr>
<td>4</td><td>5</td><td>6</td>
</tr>
</table>
</div>
</td>
<td class="left">
<a href="https://en.wikipedia.org/wiki/Row-_and_column-major_order" target="_blank"><strong>Row-major</strong> order</a>.
</td>
</tr>
<tr>
<td>
<div class="matrix" id="column-major-3x2">
<div class="matrix-bracket-left"></div>
<div class="matrix-bracket-right"></div>
<table>
<tr>
<td>1</td><td>3</td><td>5</td>
</tr>
<tr>
<td>2</td><td>4</td><td>6</td>
</tr>
</table>
</div>
</td>
<td class="left">
<a href="https://en.wikipedia.org/wiki/Row-_and_column-major_order" target="_blank"><strong>Column-major</strong> order</a>.
</td>
</tr>
</table>
</div>
<h4 id="Vectors">Vectors are slices</h4>
<p>
While a matrix is a two-dimensional <em>grid</em> of numbers,
a vector is more like a <em>slice</em> of numbers—such as
a “skinny” matrix that is only one column wide,
<!-- (a <em>column vector</em>), -->
or a “flat” matrix that is only one row high.
<!-- (a <em>row</em> vector). -->
Let’s look at some examples of
matrices that are simultaneously vectors.
</p>
<br>
<div class="center">
<table>
<tr>
<td>
<div class="matrix">
<div class="matrix-bracket-left"></div>
<div class="matrix-bracket-right"></div>
<table>
<tr><td>1</td><td>2</td><td>3</td><td>4</td></tr>
</table>
</div>
</td>
<td>
<div class="middle">
Any “flat” matrix is<br>
a <em>row</em> vector.
</div>
</td>
</tr>
<tr>
<td>
<div class="matrix">
<div class="matrix-bracket-left"></div>
<div class="matrix-bracket-right"></div>
<table>
<tr><td>1</td></tr>
<tr><td>2</td></tr>
<tr><td>3</td></tr>
<tr><td>4</td></tr>
</table>
</div>
</td>
<td>
<div class="middle">
Any “skinny” matrix is<br>
a <em>column</em> vector.
</div>
</td>
</tr>
<tr>
<td>
<div class="matrix">
<div class="matrix-bracket-left"></div>
<div class="matrix-bracket-right"></div>
<table>
<tr><td>1</td><td>2</td></tr>
<tr><td>3</td><td>4</td></tr>
</table>
</div>
</td>
<td>
<div class="middle">
But matrices with<br>
more than one column<br>
or more than one row<br>
are <strong>not</strong> vectors.
</div>
</td>
</tr>
</table>
</div>
<br>
<p>
While the above 2 × 2 matrix is not a vector,
you could say that it <em>contains</em> vectors:
Two <em>column</em> vectors
or two <em>row</em> vectors.
</p>
<p>
Because vectors are just a type of matrix
we can
<a href="#.add">add</a> them,
<a href="#.multiply">multiply</a> them,
and so on—just like any other matrix.
Vectors will play a prominent role in defining
<a href="Q-Qubit.html">qubits</a>
and expressing the state of a
<a href="Q-Circuit.html">quantum circuit</a>.
</p>
<h4>Complex numbers</h4>
<p>
Instead of just storing
<a href="Q-ComplexNumber.html#Real_numbers">regular old numbers</a>,
our matrices are geared to store
<a href="Q-ComplexNumber.html#Complex_numbers">complex numbers</a>.
(This is because
<a href="Q-Qubit.html">qubits</a> are really just a pair of
complex numbers
that we store in a 1 × 2 matrix.
So, yes—the example matrices above are actually all <em>larger</em> than qubits are!)
In general, we don’t even have to think about
the fact that our matrices are storing complex numbers
because
<code><a href="Q.html">Q</a>.<a href="Q-Matrix.html#Constructor">Matrix</a></code> is
happy to accept regular JavaScript <code>Number</code> values as input—and
<code><a href="Q.html">Q</a>.<a href="Q-ComplexNumber.html#Constructor">ComplexNumber</a></code>
will silently handle the conversion for us.
</p>
<hr>
<h3 id="Constructor">Constructor</h3>
<p>
<span class="constructor">Matrix</span>
<code class="value-type">Function([ size: Number ] or [ width: Number, height: Number ] or [ rows: arguments ]) => <a href="Q.html">Q</a>.Matrix</code>
<br>
The <code>Matrix</code> class creates and operates on matrices of arbitrary dimensions.
This is in contrast to some popular graphics libraries
which optimize for specific sizes of matrices—with corresponding class names like
<code>Matrix3</code> (for 3 × 3 matrices) or <code>Matrix4</code> (for 4 × 4 matrices).
Q, meanwhile, is much more flexible.
The constructor expects an argument list of
equal-length arrays where each array represents a row of column values.
<code>Matrix</code> then automatically determines the dimensions based on the number of
arguments (rows) and length of each row (number of columns).
The constructor will throw an error if the row lengths are not equal.
</p>
<p>
Upon creation <code>Matrix</code> converts all argument values of type <code>Number</code>
to <code><a href="Q.html">Q</a>.<a href="Q-ComplexNumber.html">ComplexNumber</a></code> instances.
Currently <code>Matrix</code> does not support recursion;
a matrix cannot contain matrices as values.
A matrix also cannot change its dimensions, making destructive properties
that yield matrices of a different size (like <code>multiply$</code>, for example) impossible.
</p>
<pre><code>
var a = new <a href="Q.html">Q</a>.Matrix(
[ 1, 2, 3 ],
[ 4, 5, 6 ])
</code></pre>
<div class="maths">
<div class="matrix">
<div class="matrix-bracket-left"></div>
<div class="matrix-bracket-right"></div>
<table>
<tr>
<td>1</td><td>2</td><td>3</td>
</tr>
<tr>
<td>4</td><td>5</td><td>6</td>
</tr>
</table>
</div>
</div>
<ul class="properties">
<li>
<dt id="this.rows">rows</dt>
<dd>
<code class="value-type">Array</code>
The list of supplied <code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/arguments" target="_blank">arguments</a></code>.
</dd>
</li>
<li>
<dt id="this.columns">columns</dt>
<dd>
<code class="value-type">Array</code>
The list of getters and setters that operate on the <a href="#this.rows">rows</a> property to appear as if this property contained actual values.
</dd>
</li>
<li>
<dt id="this.index">index</dt>
<dd>
<code class="value-type">Number</code>
An identification number assigned to the instance,
used for minding the total number of instances created.
</dd>
</li>
</ul>
<h4 id="Import_and_export_formats">Import and export formats</h4>
<p>
Getting data in and out of any system can be laborious.
With that in mind, <code><a href="Q.html">Q</a>.Matrix</code> comes with helper methods for
importing and exporting the following common formats:
</p>
<ul>
<li><a href="#.fromCsv">Comma separated values (CSV)</a></li>
<li><a href="#.fromTsv">Tab separated values (TSV)</a></li>
<li><a href="#.fromXsv">Arbitrary character separated values (XSV)</a></li>
<li><a href="#.fromHtml">HTML table code</a></li>
</ul>
<hr>
<h3 id="Static_properties">Static properties</h3>
<ul class="properties">
<li>
<dt id=".help">help</dt>
<dd>
<code class="value-type">Function ⇒ String</code>
Calls and returns the value of
<code><a href="Q.html">Q</a>.<a href="#.help">help</a></code>,
passing <code><a href="Q.html">Q</a>.Matrix</code> as the argument.
</dd>
</li>
<li>
<dt id=".index">index</dt>
<dd>
<code class="value-type">Number</code>
The number of instances created so far.
</dd>
</li>
</ul>
<h4>Constants and constant creation</h4>
<ul class="properties">
<li>
<dt id=".constants">constants</dt>
<dd>
<code class="value-type">Object</code>
Constants are appended <em>directly</em> to the
<code><a href="Q.html">Q</a>.Matrix</code> object.
For convenience they are also appended to this
<code><a href="Q.html">Q</a>.Matrix</code>.constants</code> object
to make looking up constants in the JavaScript console trivial,
and to make iterating across all constants convenient via functions like
<code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/entries" target="_blank">Object.entries</a></code>,
<code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys" target="_blank">Object.keys</a></code>,
<code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/values" target="_blank">Object.values</a></code>,
and so on.
<!-- Configured to be unwritable once appended via
<code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty" target="_blank">Object.defineProperty</a></code>
and they are labeled in uppercase to signal to us that this is so. -->
The intention that a property act as a constant is signaled
by its labelling in all-uppercase.
</dd>
</li>
<li>
<dt id=".createConstant">createConstant</dt>
<dd>
<code class="value-type">Function( key: String, value: * )<!-- → undefined --></code>
Appends a property named by <code>key</code>
with a value of <code>value</code>
to both the
<code>Matrix</code> object
and its <code><a href="#.constants">constants</a></code> property.
</dd>
</li>
<li>
<dt id=".createConstants">createConstants</dt>
<dd>
<code class="value-type">Function( … )</code>
Expects an even number of arguments.
Will use each pair in the sequence of arguments to call
<code><a href="#.createConstant">createConstant</a></code>.
</dd>
</li>
</ul>
<h4 id="Example_matrices">Constants — Example matrices</h4>
<ul class="properties">
<li>
<dt id=".IDENTITY_2X2">IDENTITY_2X2</dt>
<dd>
<code class="value-type"><a href="Q.html">Q</a>.Matrix</code>
Initialized as
<code><a href="Q.html">Q</a>.Matrix.<a href="#.createIdentity">createIdentity</a>( 2 )</code>.
Described by the following matrix:
<div class="maths">
<div class="matrix">
<div class="matrix-bracket-left"></div>
<div class="matrix-bracket-right"></div>
<table>
<tr>
<td>1</td><td>0</td>
</tr>
<tr>
<td>0</td><td>1</td>
</tr>
</table>
</div>
</div>
</dd>
</li>
<li>
<dt id=".IDENTITY_3X3">IDENTITY_3X3</dt>
<dd>
<code class="value-type"><a href="Q.html">Q</a>.Matrix</code>
Initialized as
<code><a href="Q.html">Q</a>.Matrix.<a href="#.createIdentity">createIdentity</a>( 3 )</code>.
Described by the following matrix:
<div class="maths">
<div class="matrix">
<div class="matrix-bracket-left"></div>
<div class="matrix-bracket-right"></div>
<table>
<tr>
<td>1</td><td>0</td><td>0</td>
</tr>
<tr>
<td>0</td><td>1</td><td>0</td>
</tr>
<tr>
<td>0</td><td>0</td><td>1</td>
</tr>
</table>
</div>
</div>
</dd>
</li>
<li>
<dt id=".IDENTITY_4X4">IDENTITY_4X4</dt>
<dd>
<code class="value-type"><a href="Q.html">Q</a>.Matrix</code>
Initialized as
<code><a href="Q.html">Q</a>.Matrix.<a href="#.createIdentity">createIdentity</a>( 4 )</code>.
Described by the following matrix:
<div class="maths">
<div class="matrix">
<div class="matrix-bracket-left"></div>
<div class="matrix-bracket-right"></div>
<table>
<tr>
<td>1</td><td>0</td><td>0</td><td>0</td>
</tr>
<tr>
<td>0</td><td>1</td><td>0</td><td>0</td>
</tr>
<tr>
<td>0</td><td>0</td><td>1</td><td>0</td>
</tr>
<tr>
<td>0</td><td>0</td><td>0</td><td>1</td>
</tr>
</table>
</div>
</div>
</dd>
</li>
<li>
<dt id=".CONSTANT0_2X2">CONSTANT0_2X2</dt>
<dd>
<code class="value-type"><a href="Q.html">Q</a>.Matrix</code>
Initialized as
<pre><code>
new <a href="Q.html">Q</a>.Matrix(
[ 1, 1 ],
[ 0, 0 ])
</code></pre>
Described by the following matrix:
<div class="maths">
<div class="matrix">
<div class="matrix-bracket-left"></div>
<div class="matrix-bracket-right"></div>
<table>
<tr>
<td>1</td><td>1</td>
</tr>
<tr>
<td>0</td><td>0</td>
</tr>
</table>
</div>
</div>
</dd>
</li>
<li>
<dt id=".CONSTANT1_2X2">CONSTANT1_2X2</dt>
<dd>
<code class="value-type"><a href="Q.html">Q</a>.Matrix</code>
Initialized as
<pre><code>
new <a href="Q.html">Q</a>.Matrix(
[ 0, 0 ],
[ 1, 1 ])
</code></pre>
Described by the following matrix:
<div class="maths">
<div class="matrix">
<div class="matrix-bracket-left"></div>
<div class="matrix-bracket-right"></div>
<table>
<tr>
<td>0</td><td>0</td>
</tr>
<tr>
<td>1</td><td>1</td>
</tr>
</table>
</div>
</div>
</dd>
</li>
<li>
<dt id=".NEGATION_2X2">NEGATION_2X2</dt>
<dd>
<code class="value-type"><a href="Q.html">Q</a>.Matrix</code>
Initialized as
<pre><code>
new <a href="Q.html">Q</a>.Matrix(
[ 0, 1 ],
[ 1, 0 ])
</code></pre>
Described by the following matrix:
<div class="maths">
<div class="matrix">
<div class="matrix-bracket-left"></div>
<div class="matrix-bracket-right"></div>
<table>
<tr>
<td>0</td><td>1</td>
</tr>
<tr>
<td>1</td><td>0</td>
</tr>
</table>
</div>
</div>
</dd>
</li>
<li>
<dt id=".TEST_MAP_9X9">TEST_MAP_9X9</dt>
<dd>
<code class="value-type"><a href="Q.html">Q</a>.Matrix</code>
Initialized as
<pre><code>
new <a href="Q.html">Q</a>.Matrix(
[ 11, 21, 31, 41, 51, 61, 71, 81, 91 ],
[ 12, 22, 32, 42, 52, 62, 72, 82, 92 ],
[ 13, 23, 33, 43, 53, 63, 73, 83, 93 ],
[ 14, 24, 34, 44, 54, 64, 74, 84, 94 ],
[ 15, 25, 35, 45, 55, 65, 75, 85, 95 ],
[ 16, 26, 36, 46, 56, 66, 76, 86, 96 ],
[ 17, 27, 37, 47, 57, 67, 77, 87, 97 ],
[ 18, 28, 38, 48, 58, 68, 78, 88, 98 ],
[ 19, 29, 39, 49, 59, 69, 79, 89, 99 ])
</code></pre>
Described by the following matrix:
<div class="maths">
<div class="matrix">
<div class="matrix-bracket-left"></div>
<div class="matrix-bracket-right"></div>
<table>
<tr>
<td>11</td>
<td>21</td>
<td>31</td>
<td>41</td>
<td>51</td>
<td>61</td>
<td>71</td>
<td>81</td>
<td>91</td>
</tr>
<tr>
<td>12</td>
<td>22</td>
<td>32</td>
<td>42</td>
<td>52</td>
<td>62</td>
<td>72</td>
<td>82</td>
<td>92</td>
</tr>
<tr>
<td>13</td>
<td>23</td>
<td>33</td>
<td>43</td>
<td>53</td>
<td>63</td>
<td>73</td>
<td>83</td>
<td>93</td>
</tr>
<tr>
<td>14</td>
<td>24</td>
<td>34</td>
<td>44</td>
<td>54</td>
<td>64</td>
<td>74</td>
<td>84</td>
<td>94</td>
</tr>
<tr>
<td>15</td>
<td>25</td>
<td>35</td>
<td>45</td>
<td>55</td>
<td>65</td>
<td>75</td>
<td>85</td>
<td>95</td>
</tr>
<tr>
<td>16</td>
<td>26</td>
<td>36</td>
<td>46</td>
<td>56</td>
<td>66</td>
<td>76</td>
<td>86</td>
<td>96</td>
</tr>
<tr>
<td>17</td>
<td>27</td>
<td>37</td>
<td>47</td>
<td>57</td>
<td>67</td>
<td>77</td>
<td>87</td>
<td>97</td>
</tr>
<tr>
<td>18</td>
<td>28</td>
<td>38</td>
<td>48</td>
<td>58</td>
<td>68</td>
<td>78</td>
<td>88</td>
<td>98</td>
</tr>
<tr>
<td>19</td>
<td>29</td>
<td>39</td>
<td>49</td>
<td>59</td>
<td>69</td>
<td>79</td>
<td>89</td>
<td>99</td>
</tr>
</table>
</div>
</div>
</dd>
</li>
</ul>
<h4>Static inspection</h4>
<ul class="properties">
<li>
<dt id=".isMatrixLike">isMatrixLike</dt>
<dd>
<code class="value-type">Function( object: * ) ⇒ Boolean</code>
Returns <code>true</code>
if <code>object</code> is an instance of
<code><a href="Q.html">Q</a>.Matrix</code>
or if <code><a href="Q.html">Q</a>.Matrix</code>
is in <code>object</code>’s prototype chain,
otherwise returns <code>false</code>.
</dd>
</li>
<li>
<dt id=".getWidth">getWidth</dt>
<dd>
<code class="value-type">Function( m: <a href="Q.html">Q</a>.Matrix ) ⇒ Number</code>
Returns the number of columns in this matrix.
</dd>
</li>
<li>
<dt id=".getHeight">getHeight</dt>
<dd>
<code class="value-type">Function( m: <a href="Q.html">Q</a>.Matrix ) ⇒ Number</code>
Returns the number of rows in this matrix.
</dd>
</li>
<li>
<dt id=".haveEqualDimensions">haveEqualDimensions</dt>
<dd>
<code class="value-type">Function( a: <a href="Q.html">Q</a>.Matrix, b: <a href="Q.html">Q</a>.Matrix ) ⇒ Boolean</code>
Returns <code>true</code>
if both matrices have the same number of rows
and the same number of columns,
otherwise returns <code>false</code>.
</dd>
</li>
<li>
<dt id=".isWithinRange">isWithinRange</dt>
<dd>
<code class="value-type">Function( n: Number, minimum: Number, maximum: Number ) ⇒ Boolean</code>
Returns <code>true</code>
if <code>n</code> is an integer,
and is greater than or equal to <code>minimum</code>,
and is less than or equal to <code>maximum</code>,
otherwise returns <code>false</code>.
Used to determine if a value is a valid row or column number.
</dd>
</li>
</ul>
<h4>Creation from description</h4>
<ul class="properties">
<li>
<dt id=".createSquare">createSquare</dt>
<dd>
<code class="value-type">Function([ size: Number = 2[, f: Function = function(){ return 0 }]]) ⇒ <a href="Q.html">Q</a>.Matrix</code>
Creates a square matrix of width and height equal to <code>size</code>.
<code>f</code> is invoked for each cell of the matrix
and is passed two arguments,
<code>x: Number</code> and <code>y: Number</code>,
which correspond to the address of the cell.
The result of <code>f</code> is then assigned to that cell.
Returns the resulting matrix.
</dd>
</li>
<li>
<dt id=".createZero">createZero</dt>
<dd>
<code class="value-type">Function( size: Number ) ⇒ <a href="Q.html">Q</a>.Matrix</code>
Calls <code><a href="#.createSquare">createSquare</a></code>
with the passed <code>size</code> argument,
but no function argument,
to yield a matrix of all zeros.
Returns the resulting matrix.
</dd>
</li>
<li>
<dt id=".createOne">createOne</dt>
<dd>
<code class="value-type">Function( size: Number ) ⇒ <a href="Q.html">Q</a>.Matrix</code>
Calls <code><a href="#.createSquare">createSquare</a></code>
with the passed <code>size</code> argument,
and an <code>f</code> argument that invariably returns <code>1</code>,
to yield a matrix of all ones.
Returns the resulting matrix.
</dd>
</li>
<li>
<dt id=".createIdentity">createIdentity</dt>
<dd>
<code class="value-type">Function( size: Number ) ⇒ <a href="Q.html">Q</a>.Matrix</code>
Calls <code><a href="#.createSquare">createSquare</a></code>
with the passed <code>size</code> argument,
and an <code>f</code> argument
that yields an identity matrix.
Returns the resulting matrix.
</dd>
</li>
</ul>
<h4>Creation from data import</h4>
<ul class="properties">
<!-- li>
<dt id=".from">from</dt>
<dd>
<code class="value-type">Function( format: String ) ⇒ Function</code>
Returns a <code><a href="Q.html">Q</a>.Matrix</code> static method
of the name <code>'from'+ format</code> (if one exists),
otherwise returns an instance of
<code><a href="Q.html">Q</a>.<a href="Q.html#error">error</a></code>.
</dd>
</li -->
<li>
<dt id=".fromArray">fromArray</dt>
<dd>
<code class="value-type">Function( array: Array ) ⇒ <a href="Q.html">Q</a>.Matrix</code>
Ingests matrix data from an <code>Array</code> of
values where each element represents a row
that is itself an <code>Array</code> of values,
and returns the result.
Note how this differs from the <code>Matrix</code>
<a href="#Constructor">constructor</a>
which uses the function’s <code>Array</code>-like arguments list directly.
</dd>
</li>
<li>
<dt id=".fromXsv">fromXsv</dt>
<dd>
<code class="value-type">Function( input: String, rowSeparator: String, valueSeparator: String ) ⇒ <a href="Q.html">Q</a>.Matrix</code>
Ingests matrix data from a <code>String</code> of
values that are sepearated in to rows by <code>rowSeparator</code>
and separated in to values (columns) by <code>valueSeparator</code>,
and returns the result.
</dd>
</li>
<li>
<dt id=".fromCsv">fromCsv</dt>
<dd>
<code class="value-type">Function( csv: String ) ⇒ <a href="Q.html">Q</a>.Matrix</code>
Ingests matrix data from a <code>String</code> of
comma-separated-values
and returns the result.
</dd>
</li>
<li>
<dt id=".fromTsv">fromTsv</dt>
<dd>
<code class="value-type">Function( tsv: String ) ⇒ <a href="Q.html">Q</a>.Matrix</code>
Ingests matrix data from a <code>String</code> of
tab-separated-values
and returns the result.
</dd>
</li>
<li>
<dt id=".fromHtml">fromHtml</dt>
<dd>
<code class="value-type">Function( html: String ) ⇒ <a href="Q.html">Q</a>.Matrix</code>
Ingests matrix data from a <code>String</code> of
HTML table code
and returns the result.
</dd>
</li>
</ul>
<h4>Static maths</h4>
<ul class="properties">
<li>
<dt id=".add">add</dt>
<dd>
<code class="value-type">Function( a: <a href="Q.html">Q</a>.Matrix, b: <a href="Q.html">Q</a>.Matrix ) ⇒ <a href="Q.html">Q</a>.Matrix</code>
Adds the two supplied matrices together and returns the result.
</dd>
</li>
<li>
<dt id=".multiplyScalar">multiplyScalar</dt>
<dd>
<code class="value-type">Function( a: <a href="Q.html">Q</a>.Matrix, b: Number ) ⇒ <a href="Q.html">Q</a>.Matrix</code>
Multiplies the supplied matrix by the supplied scalar and returns the result.
</dd>
</li>
<li>
<dt id=".multiply">multiply</dt>
<dd>
<code class="value-type">Function( a: <a href="Q.html">Q</a>.Matrix, b: <a href="Q.html">Q</a>.Matrix ) ⇒ <a href="Q.html">Q</a>.Matrix</code>
Multiplies the two supplied matrices together and returns the result.
</dd>
</li>
<li>
<dt id=".multiplyTensor">multiplyTensor</dt>
<dd>
<code class="value-type">Function( a: <a href="Q.html">Q</a>.Matrix, b: <a href="Q.html">Q</a>.Matrix ) ⇒ <a href="Q.html">Q</a>.Matrix</code>
Returns the <code><a href="https://en.wikipedia.org/wiki/Tensor_product" target="_blank">tensor product</a></code>
of the two supplied matrices.
</dd>
</li>
</ul>
<hr>
<h3 id="Prototype_properties">Prototype properties</h3>
<h4>Self inspection</h4>
<ul class="properties">
<li>
<dt id=".prototype.isValidRow">isValidRow</dt>
<dd>
<code class="value-type">Function( rowIndex: Number ) ⇒ Boolean</code>
Returns true if <code>rowIndex</code>
is greater than or equal to zero
and is less than the height of this matrix,
otherwise returns <code>false</code>.
Will return a <code>Boolean</code> value,
thereby halting
<a href="https://en.wikipedia.org/wiki/Fluent_interface" target="_blank">“Fluent interface” method chaining</a>
for this instance.
</dd>
</li>
<li>
<dt id=".prototype.isValidColumn">isValidColumn</dt>
<dd>
<code class="value-type">Function( columnIndex: Number ) ⇒ Boolean</code>
Returns true if <code>columnIndex</code>
is greater than or equal to zero
and is less than the width of this matrix,
otherwise returns <code>false</code>.
Will return a <code>Boolean</code> value,
thereby halting
<a href="https://en.wikipedia.org/wiki/Fluent_interface" target="_blank">“Fluent interface” method chaining</a>
for this instance.
</dd>
</li>
<li>
<dt id=".prototype.isValidAddress">isValidAddress</dt>
<dd>
<code class="value-type">Function( x: Number, y: Number ) ⇒ Boolean</code>
Returns <code>true</code>
if <code>x</code> is a valid row index
and <code>y</code> is a valid column index,
otherwise returns <code>false</code>.
Will return a <code>Boolean</code> value,
thereby halting
<a href="https://en.wikipedia.org/wiki/Fluent_interface" target="_blank">“Fluent interface” method chaining</a>
for this instance.
</dd>
</li>
<li>
<dt id=".prototype.getWidth">getWidth</dt>
<dd>
<code class="value-type">Function ⇒ Number</code>
Calls and returns the value of
<code><a href="Q.html">Q</a>.Matrix.<a href="#.getWidth">getWidth</a></code>,
passing itself as the argument.
Will return a <code>Number</code> value,
thereby halting
<a href="https://en.wikipedia.org/wiki/Fluent_interface" target="_blank">“Fluent interface” method chaining</a>
for this instance.
</dd>
</li>
<li>
<dt id=".prototype.getHeight">getHeight</dt>
<dd>
<code class="value-type">Function ⇒ Number</code>
Calls and returns the value of
<code><a href="Q.html">Q</a>.Matrix.<a href="#.getHeight">getHeight</a></code>,
passing itself as the argument.
Will return a <code>Number</code> value,
thereby halting
<a href="https://en.wikipedia.org/wiki/Fluent_interface" target="_blank">“Fluent interface” method chaining</a>
for this instance.
</dd>
</li>
</ul>
<h4>Data export (non-destructive)</h4>
<ul class="properties">
<li>
<dt id=".prototype.read">read</dt>
<dd>