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<title>GRASS GIS manual: r.quantile</title>
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<h2>NAME</h2>
<em><b>r.quantile</b></em> - Compute quantiles using two passes.
<h2>KEYWORDS</h2>
raster, statistics
<h2>SYNOPSIS</h2>
<b>r.quantile</b><br>
<b>r.quantile help</b><br>
<b>r.quantile</b> [-<b>r</b>] <b>input</b>=<em>name</em> [<b>quantiles</b>=<em>integer</em>] [<b>percentiles</b>=<em>float</em>[,<i>float</i>,...]] [<b>bins</b>=<em>integer</em>] [--<b>verbose</b>] [--<b>quiet</b>]
<h3>Flags:</h3>
<DL>
<DT><b>-r</b></DT>
<DD>Generate recode rules based on quantile-defined intervals.</DD>
<DT><b>--verbose</b></DT>
<DD>Verbose module output</DD>
<DT><b>--quiet</b></DT>
<DD>Quiet module output</DD>
</DL>
<h3>Parameters:</h3>
<DL>
<DT><b>input</b>=<em>name</em></DT>
<DD>Name of input raster map</DD>
<DT><b>quantiles</b>=<em>integer</em></DT>
<DD>Number of quantiles</DD>
<DD>Default: <em>4</em></DD>
<DT><b>percentiles</b>=<em>float[,<i>float</i>,...]</em></DT>
<DD>List of percentiles</DD>
<DT><b>bins</b>=<em>integer</em></DT>
<DD>Number of bins to use</DD>
<DD>Default: <em>1000000</em></DD>
</DL>
<h2>DESCRIPTION</h2>
<em>r.quantile</em> computes quantiles in a manner suitable for use with large amounts of data.
It is using two passes.
<h2>EXAMPLE</h2>
Calculation of elevation quantiles (printed to standard-out):
<div class="code"><pre>
g.region rast=elevation -p
r.quantile input=elevation percentiles=0.1,1,10,25,50,75,90,99,99.9
</pre></div>
The output of <em>r.quantile</em> can be used for quantile classification:
<div class="code"><pre>
g.region rast=elevation -p
r.quantile elevation quantiles=5 -r --quiet | r.recode elevation \
out=elev_quant5 rules=-
</pre></div>
<h2>SEE ALSO</h2>
<em>
<a href="r.quant.html">r.quant</a>
</em>
<h2>AUTHOR</h2>
Glynn Clements
<p>
<i>Last changed: $Date: 2013-04-10 08:52:37 -0700 (Wed, 10 Apr 2013) $</i>
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