r.quantile: quantile classification example added

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@55688 15284696-431f-4ddb-bdfa-cd5b030d7da7

raster/r.quantile/r.quantile.html

@@ -1,15 +1,23 @@
 <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.
+<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:
+Calculation of elevation quantiles (printed to standard-out):
 
 <div class="code"><pre>
-g.region rast=elevation.dem -p
-r.quantile input=elevation.dem percentiles=0.1,1,10,25,50,75,90,99,99.9
+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>
@@ -22,4 +30,5 @@ r.quantile input=elevation.dem percentiles=0.1,1,10,25,50,75,90,99,99.9
 <h2>AUTHOR</h2>
 
 Glynn Clements
-<p><i>Last changed: $Date$</i>
+<p>
+<i>Last changed: $Date$</i>