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<title>FreeMat: MESHGRID Generate Grid Mesh For Plots</title>
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<div class="title">MESHGRID Generate Grid Mesh For Plots </div> </div>
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<div class="textblock"><p>Section: <a class="el" href="sec_array.html">Array Generation and Manipulations</a> </p>
<h1><a class="anchor" id="Usage"></a>
Usage</h1>
<p>The <code>meshgrid</code> function generates arrays that can be used for the generation of surface plots. The syntax is one of </p>
<pre class="fragment"> [X,Y] = meshgrid(x)
[X,Y] = meshgrid(x,y)
[X,Y,Z] = meshgrid(x,y,z)
</pre><p> where <code>x,y,z</code> are vectors, and <code>X,Y,Z</code> are matrices. In the first case <code>[X,Y] = meshgrid(x)</code>, the rows of <code>X</code> and the columns of <code>Y</code> contain copies of the vector <code>x</code>. In the second case <code>[X,Y] = meshgrid(x,y)</code>, the rows of <code>X</code> contain copies of <code>x</code>, and the columns of <code>Y</code> contain copies of <code>y</code>. In the third case, each input is copied along the row, column or slice direction of the corresponding output variable. </p>
<h1><a class="anchor" id="Example"></a>
Example</h1>
<p>In the first example:</p>
<pre class="fragment">--> [X,Y] = meshgrid(-2:.4:2)
X =
Columns 1 to 7
-2.0000 -1.6000 -1.2000 -0.8000 -0.4000 0.0000 0.4000
-2.0000 -1.6000 -1.2000 -0.8000 -0.4000 0.0000 0.4000
-2.0000 -1.6000 -1.2000 -0.8000 -0.4000 0.0000 0.4000
-2.0000 -1.6000 -1.2000 -0.8000 -0.4000 0.0000 0.4000
-2.0000 -1.6000 -1.2000 -0.8000 -0.4000 0.0000 0.4000
-2.0000 -1.6000 -1.2000 -0.8000 -0.4000 0.0000 0.4000
-2.0000 -1.6000 -1.2000 -0.8000 -0.4000 0.0000 0.4000
-2.0000 -1.6000 -1.2000 -0.8000 -0.4000 0.0000 0.4000
-2.0000 -1.6000 -1.2000 -0.8000 -0.4000 0.0000 0.4000
-2.0000 -1.6000 -1.2000 -0.8000 -0.4000 0.0000 0.4000
-2.0000 -1.6000 -1.2000 -0.8000 -0.4000 0.0000 0.4000
Columns 8 to 11
0.8000 1.2000 1.6000 2.0000
0.8000 1.2000 1.6000 2.0000
0.8000 1.2000 1.6000 2.0000
0.8000 1.2000 1.6000 2.0000
0.8000 1.2000 1.6000 2.0000
0.8000 1.2000 1.6000 2.0000
0.8000 1.2000 1.6000 2.0000
0.8000 1.2000 1.6000 2.0000
0.8000 1.2000 1.6000 2.0000
0.8000 1.2000 1.6000 2.0000
0.8000 1.2000 1.6000 2.0000
Y =
Columns 1 to 7
-2.0000 -2.0000 -2.0000 -2.0000 -2.0000 -2.0000 -2.0000
-1.6000 -1.6000 -1.6000 -1.6000 -1.6000 -1.6000 -1.6000
-1.2000 -1.2000 -1.2000 -1.2000 -1.2000 -1.2000 -1.2000
-0.8000 -0.8000 -0.8000 -0.8000 -0.8000 -0.8000 -0.8000
-0.4000 -0.4000 -0.4000 -0.4000 -0.4000 -0.4000 -0.4000
0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
0.4000 0.4000 0.4000 0.4000 0.4000 0.4000 0.4000
0.8000 0.8000 0.8000 0.8000 0.8000 0.8000 0.8000
1.2000 1.2000 1.2000 1.2000 1.2000 1.2000 1.2000
1.6000 1.6000 1.6000 1.6000 1.6000 1.6000 1.6000
2.0000 2.0000 2.0000 2.0000 2.0000 2.0000 2.0000
Columns 8 to 11
-2.0000 -2.0000 -2.0000 -2.0000
-1.6000 -1.6000 -1.6000 -1.6000
-1.2000 -1.2000 -1.2000 -1.2000
-0.8000 -0.8000 -0.8000 -0.8000
-0.4000 -0.4000 -0.4000 -0.4000
0.0000 0.0000 0.0000 0.0000
0.4000 0.4000 0.4000 0.4000
0.8000 0.8000 0.8000 0.8000
1.2000 1.2000 1.2000 1.2000
1.6000 1.6000 1.6000 1.6000
2.0000 2.0000 2.0000 2.0000
</pre><p>Next, we use different vectors for <code>X</code> and for <code>Y</code>:</p>
<pre class="fragment">--> [X,Y] = meshgrid([1,2,3,4],[6,7,8])
X =
1 2 3 4
1 2 3 4
1 2 3 4
Y =
6 6 6 6
7 7 7 7
8 8 8 8
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