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Solved!<br><br>I don't know whether this was the region, it seemed set valid, re-set it just to be sure. <br>Gave the same confusing result at first, but might have been the color table set wrong. <br>The results appeared to be integer with just one value, but resetting the colour table and performing a stretch gave readable results.<br><br>Thank you for your help.<br><br>Michiel<br><br><br><br><div><div id="SkyDrivePlaceholder"></div>> Date: Tue, 20 Mar 2012 09:13:35 +0100<br>> From: mlennert@club.worldonline.be<br>> To: mich_kun@hotmail.com<br>> CC: grass-user@lists.osgeo.org<br>> Subject: Re: [GRASS-user] Raster map Calculator<br>> <br>> On 19/03/12 20:42, Michiel Kunzel wrote:<br>> > Hello list,<br>> ><br>> > I am trying to create a series of ratio images using grass 6.4.1 and I<br>> > can't get the syntax for the raster calculator figured out.<br>> > What I've got at the moment is:<br>> ><br>> > 'Bar45rastfl = 1.0 * BarB40@PERMANENT / BarB50@PERMANENT'<br>> ><br>> > I've tried varying the equation above but to no avail. The resulting<br>> > maps do not contain any values.<br>> ><br>> > What am I doing wrong?<br>> <br>> Have you set your region correctly ?<br>> <br>> I.e. g.region rast=BarB40<br>> <br>> before running r.mapcalc ?<br>> <br>> Moritz<br></div> </div></body>
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