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<h3 class="section">8.4 Comparison Operators</h3>
<p><a name="index-comparison-expressions-489"></a><a name="index-expressions_002c-comparison-490"></a><a name="index-relational-operators-491"></a><a name="index-operators_002c-relational-492"></a><a name="index-less-than-operator-493"></a><a name="index-greater-than-operator-494"></a><a name="index-equality-operator-495"></a><a name="index-tests-for-equality-496"></a><a name="index-equality_002c-tests-for-497"></a>
<dfn>Comparison operators</dfn> compare numeric values for relationships
such as equality. They are written using
<em>relational operators</em>.
<p>All of Octave's comparison operators return a value of 1 if the
comparison is true, or 0 if it is false. For matrix values, they all
work on an element-by-element basis. For example,
<pre class="example"> [1, 2; 3, 4] == [1, 3; 2, 4]
⇒ 1 0
0 1
</pre>
<p>If one operand is a scalar and the other is a matrix, the scalar is
compared to each element of the matrix in turn, and the result is the
same size as the matrix.
<dl>
<dt><var>x</var><code> < </code><var>y</var><dd><a name="index-g_t_003c-498"></a>True if <var>x</var> is less than <var>y</var>.
<br><dt><var>x</var><code> <= </code><var>y</var><dd><a name="index-g_t_003c_003d-499"></a>True if <var>x</var> is less than or equal to <var>y</var>.
<br><dt><var>x</var><code> == </code><var>y</var><dd><a name="index-g_t_003d_003d-500"></a>True if <var>x</var> is equal to <var>y</var>.
<br><dt><var>x</var><code> >= </code><var>y</var><dd><a name="index-g_t_003e_003d-501"></a>True if <var>x</var> is greater than or equal to <var>y</var>.
<br><dt><var>x</var><code> > </code><var>y</var><dd><a name="index-g_t_003e-502"></a>True if <var>x</var> is greater than <var>y</var>.
<br><dt><var>x</var><code> != </code><var>y</var><dt><var>x</var><code> ~= </code><var>y</var><dd><a name="index-g_t_0021_003d-503"></a><a name="index-g_t_007e_003d-504"></a>True if <var>x</var> is not equal to <var>y</var>.
</dl>
<p>String comparisons may also be performed with the <code>strcmp</code>
function, not with the comparison operators listed above.
See <a href="Strings.html#Strings">Strings</a>.
<!-- ./general/isequal.m -->
<p><a name="doc_002disequal"></a>
<div class="defun">
— Function File: <b>isequal</b> (<var>x1, x2, <small class="dots">...</small></var>)<var><a name="index-isequal-505"></a></var><br>
<blockquote><p>Return true if all of <var>x1</var>, <var>x2</var>, <small class="dots">...</small> are equal.
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<p class="noindent"><strong>See also:</strong> <a href="doc_002disequalwithequalnans.html#doc_002disequalwithequalnans">isequalwithequalnans</a>.
</p></blockquote></div>
<!-- ./general/isequalwithequalnans.m -->
<p><a name="doc_002disequalwithequalnans"></a>
<div class="defun">
— Function File: <b>isequalwithequalnans</b> (<var>x1, x2, <small class="dots">...</small></var>)<var><a name="index-isequalwithequalnans-506"></a></var><br>
<blockquote><p>Assuming NaN == NaN, return true if all of <var>x1</var>, <var>x2</var>, <small class="dots">...</small>
are equal.
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<p class="noindent"><strong>See also:</strong> <a href="doc_002disequal.html#doc_002disequal">isequal</a>.
</p></blockquote></div>
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