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<h4 class="subsection">1.3.2 Evaluation Notation</h4>
<p><a name="index-evaluation-notation-11"></a><a name="index-documentation-notation-12"></a>
In the examples in this manual, results from expressions that you
evaluate are indicated with ‘<samp><span class="samp">⇒</span></samp>’. For example:
<pre class="example"> sqrt (2)
⇒ 1.4142
</pre>
<p class="noindent">You can read this as “<code>sqrt (2)</code> evaluates to 1.4142”.
<p>In some cases, matrix values that are returned by expressions are
displayed like this
<pre class="example"> [1, 2; 3, 4] == [1, 3; 2, 4]
⇒ [ 1, 0; 0, 1 ]
</pre>
<p class="noindent">and in other cases, they are displayed like this
<pre class="example"> eye (3)
⇒ 1 0 0
0 1 0
0 0 1
</pre>
<p class="noindent">in order to clearly show the structure of the result.
<p>Sometimes to help describe one expression, another expression is
shown that produces identical results. The exact equivalence of
expressions is indicated with ‘<samp><span class="samp">==</span></samp>’. For example:
<pre class="example"> rot90 ([1, 2; 3, 4], -1)
==
rot90 ([1, 2; 3, 4], 3)
==
rot90 ([1, 2; 3, 4], 7)
</pre>
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