[Qgis-user] Raster Calculator and LN

[Nicolas Cadieux]

Hi, 
Could it be that for your layer, 0 = null?  In that case, could this be the source of the problem?  Try changing the null value to test... Just an idea. 
Nicolas Cadieux M.Sc. 
Les Entreprises Archéotec inc.  
8548, rue Saint-Denis Montréal H2P 2H2 
Téléphone: 514.381.5112  Fax: 514.381.4995 
www.archeotec.ca 
Le 2015-03-24 10:24, "george-silva [via OSGeo.org]" <ml-node+s1560n5195151h42 at n6.nabble.com> a écrit : 

	Hello everyone, It seems that we have a bug on raster calculator. I tried searching the web for this, but here's the story: I'm developing a plugin that makes extensive use of the raster calculator. So far so good. I can enter my custom expressions and it seems to be working fine. However one of my formulas contains a LN (natural log). So, to test this properly I've created a raster all with 1 value. The LN for 1 is 0, so the whole raster should be zeroed. The raster calculator, even while programming or using the software, tells me that the expression is valid. That's not the case. Questions: 1) Is LN not implemented in the raster calculator? Is implemented? What is the syntax? Is it documented? 2) Workarounds? Is it a bug? I'm trying to look my redmine password so I can file a bug or contribute with documents for testing. Thanks George -- George R. C. Silva SIGMA Consultoria ---------------------------- http://www.consultoriasigma.com.br/ 

_______________________________________________
Qgis-user mailing list
[hidden email] 
http://lists.osgeo.org/mailman/listinfo/qgis-user 

	
	
	
	
	
	
	
		If you reply to this email, your message will be added to the discussion below: 
		http://osgeo-org.1560.x6.nabble.com/Raster-Calculator-and-LN-tp5195151.html 
	
	
		To start a new topic under Quantum GIS - User, email ml-node+s1560n4125267h38@n6.nabble.com 
		To unsubscribe from Quantum GIS - User, click here . 
		NAML 
	



--
View this message in context: http://osgeo-org.1560.x6.nabble.com/Raster-Calculator-and-LN-tp5195151p5195208.html
Sent from the Quantum GIS - User mailing list archive at Nabble.com.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-user/attachments/20150324/cd856e4a/attachment.html>