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<title>synth: Gwyddion Data Processing Library Reference Manual</title>
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<a href="#libgwyprocess-synth.description" class="shortcut">Description</a></span>
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<h2><span class="refentrytitle"><a name="libgwyprocess-synth.top_of_page"></a>synth</span></h2>
<p>synth — Synthetic data generation</p>
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<div class="refsect1">
<a name="libgwyprocess-synth.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_proto_type">
<col class="functions_proto_name">
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<td class="function_type">
<span class="returnvalue">void</span>
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<td class="function_name">
<a class="link" href="libgwyprocess-synth.html#gwy-data-field-synth-gaussian-displacement" title="gwy_data_field_synth_gaussian_displacement ()">gwy_data_field_synth_gaussian_displacement</a> <span class="c_punctuation">()</span>
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<div class="refsect1">
<a name="libgwyprocess-synth.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include <libprocess/gwyprocess.h>
</pre>
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<div class="refsect1">
<a name="libgwyprocess-synth.description"></a><h2>Description</h2>
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<div class="refsect1">
<a name="libgwyprocess-synth.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="gwy-data-field-synth-gaussian-displacement"></a><h3>gwy_data_field_synth_gaussian_displacement ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gwy_data_field_synth_gaussian_displacement
(<em class="parameter"><code><a class="link" href="GwyDataField.html" title="GwyDataField"><span class="type">GwyDataField</span></a> *data_field</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> sigma</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> tau</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Random-Numbers.html#GRand"><span class="type">GRand</span></a> *rng</code></em>);</pre>
<p>Fills a data field with correlated Gaussian noise, suitable as displacement field.</p>
<p>The number of calls to <em class="parameter"><code>rng</code></em>
is unspecified; it will not be left in any defined state. However, the noise is filled
from the data field centre. Meaning that changing <em class="parameter"><code>tau</code></em>
will zoom in or out the Gaussian noise, preserving the
centr (whereas changing <em class="parameter"><code>sigma</code></em>
simply changes the amplitude).</p>
<div class="refsect3">
<a name="gwy-data-field-synth-gaussian-displacement.parameters"></a><h4>Parameters</h4>
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<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
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<tbody>
<tr>
<td class="parameter_name"><p>data_field</p></td>
<td class="parameter_description"><p>A data field.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>sigma</p></td>
<td class="parameter_description"><p>Amplitude of displacement (in units of 1, usually meaning pixels).</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>tau</p></td>
<td class="parameter_description"><p>Lateral scale of displacement variation (in pixels).</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>rng</p></td>
<td class="parameter_description"><p>Random number generator.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
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<p class="since">Since: <a class="link" href="api-index-2-59.html#api-index-2.59">2.59</a></p>
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