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<span id="Evaluation-Notation-1"></span><h4 class="subsection">1.3.2 Evaluation Notation</h4>
<span id="index-evaluation-notation"></span>
<span id="index-documentation-notation"></span>
<p>In the examples in this manual, results from expressions that you
evaluate are indicated with ‘<samp>⇒</samp>’. For example:
</p>
<div class="example">
<pre class="example">sqrt (2)
⇒ 1.4142
</pre></div>
<p>You can read this as “<code>sqrt (2)</code> evaluates to 1.4142”.
</p>
<p>In some cases, matrix values that are returned by expressions are
displayed like this
</p>
<div class="example">
<pre class="example">[1, 2; 3, 4] == [1, 3; 2, 4]
⇒ [ 1, 0; 0, 1 ]
</pre></div>
<p>and in other cases, they are displayed like this
</p>
<div class="example">
<pre class="example">eye (3)
⇒ 1 0 0
0 1 0
0 0 1
</pre></div>
<p>in order to clearly show the structure of the result.
</p>
<p>Sometimes to help describe one expression, another expression is shown
that produces identical results. The exact equivalence of expressions
is indicated with ‘<samp>≡</samp>’. For example:
</p>
<div class="example">
<pre class="example">rot90 ([1, 2; 3, 4], -1)
≡
rot90 ([1, 2; 3, 4], 3)
≡
rot90 ([1, 2; 3, 4], 7)
</pre></div>
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