[GRASS-user] r.mapcalculator / r.mapcalc not producing raster

[jaydub]

Hi all, I'm trying to combine two raster using the r.mapcalc/r.mapcalculator
but am getting no where. I'm using python. 

# I did this previously... so "dem" and "rain" exist as rasters
grass.run_command("r.in.gdal",input="<location>/dem.tif",output="dem")
grass.run_command("r.in.gdal",input="<location>/rain.tif",output="rain")

# Then I try this...
grass.run_command("r.mapcalculator",amap="dem",bmap="rain",formula="A *
B",outfile="test_combo")

The output from that gives me...
r.mapcalc "test_combo" = "( "dem" * "rain" )"
 100%
Done.

When I try to add "test_combo" to the display in GRASS, nothing shows, even
when I try to zoom to the layer in GRASS.

r.info gives me the following:
+----------------------------------------------------------------------------+
 | Layer:    test_combo2                    Date: Fri Feb 18 13:19:52 2011   
|
 | Mapset:   PERMANENT                      Login of Creator: jay            
|
 | Location: newLocation                                                     
|
 | DataBase: .........                                              |
 | Title:     ( test_combo )                                                
|
 | Timestamp: none                                                           
|

|----------------------------------------------------------------------------|
 |                                                                           
|
 |   Type of Map:  raster               Number of Categories: 255            
|
 |   Data Type:    FCELL                                                     
|
 |   Rows:         20                                                        
|
 |   Columns:      20                                                        
|
 |   Total Cells:  400                                                       
|
 |        Projection: Lambert Conformal Conic                                
|
 |            N: 707999.97864227    S: 628766.19610209   Res: 3961.68912701  
|
 |            E: 827306.35554785    W: 607862.24148022   Res: 10972.20570338 
|
 |   Range of data:    min = 0.000000  max = 4241302.000000                  
|
 |                                                                           
|
 |   Data Description:                                                       
|
 |    generated by r.mapcalc                                                 
|
 |                                                                           
|
 |   Comments:                                                               
|
 |    dem * rain                                                             
|
 |                                                                           
|

+----------------------------------------------------------------------------+

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