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Next: <a href="Printing-Notation.html#Printing-Notation" accesskey="n" rel="next">Printing Notation</a>, Previous: <a href="Fonts.html#Fonts" accesskey="p" rel="prev">Fonts</a>, Up: <a href="Conventions.html#Conventions" accesskey="u" rel="up">Conventions</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Evaluation-Notation-1"></a>
<h4 class="subsection">1.3.2 Evaluation Notation</h4>
<a name="index-evaluation-notation"></a>
<a name="index-documentation-notation"></a>

<p>In the examples in this manual, results from expressions that you
evaluate are indicated with &lsquo;<samp>&rArr;</samp>&rsquo;.  For example:
</p>
<div class="example">
<pre class="example">sqrt (2)
     &rArr; 1.4142
</pre></div>

<p>You can read this as &ldquo;<code>sqrt (2)</code> evaluates to 1.4142&rdquo;.
</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]
     &rArr; [ 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)
     &rArr;  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 &lsquo;<samp>&equiv;</samp>&rsquo;.  For example:
</p>
<div class="example">
<pre class="example">rot90 ([1, 2; 3, 4], -1)
&equiv;
rot90 ([1, 2; 3, 4], 3)
&equiv;
rot90 ([1, 2; 3, 4], 7)
</pre></div>




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