[GRASS-dev] [GRASS GIS] #3431: r.mapcalculator script for QGIS processing

[GRASS GIS]

#3431: r.mapcalculator script for QGIS processing
-------------------------+-------------------------------------------------
  Reporter:  neteler     |      Owner:  wenzeslaus
      Type:              |     Status:  new
  enhancement            |
  Priority:  normal      |  Milestone:  7.6.0
 Component:  Python      |    Version:  7.2.2
Resolution:              |   Keywords:  r.mapcalculator, r.mapcalc,
       CPU:              |  r3.mapcalculator, r3.mapcalc, QGIS
  Unspecified            |   Platform:  Unspecified
-------------------------+-------------------------------------------------

Comment (by wenzeslaus):

 See sandbox for source code (Subversion history preserved, but it is a
 complete rewrite anyway):

 source:sandbox/wenzeslaus/r.mapcalculator (r73642)

 {{{
 Usage:
  r.mapcalculator [-sqc] expression=string [a=name] [b=name] [c=name]
    [d=name] [e=name] [f=name] output=value [seed=value] [--help]
    [--verbose] [--quiet] [--ui]

 Flags:
   -s   Generate random seed (result is non-deterministic)
   -q   Quote the map names
   -c   Case sensitive variable names

 Parameters:
   expression   Formula (e.g. A-B or A*C+B)
            a   A
            b   B
            c   C
            d   D
            e   E
            f   F
       output   Name for output raster map
         seed   Seed for rand() function
 }}}

 {{{
 r.mapcalculator expression="0" output=zeros
 r.mapcalculator expression="1" output=ones
 r.mapcalculator expression="2" output=twos
 r.mapcalculator expression="(A * B) / 2 + 3 * C" a=zeros b=ones c=twos
 output=result2
 }}}

 If you don't have sandbox repo, you can install also using:

 {{{
 g.extension r.mapcalculator
 url=https://trac.osgeo.org/grass/browser/sandbox/wenzeslaus/r.mapcalculator
 }}}

 I tried to cover in the documentation what are the differences to 5/6
 version and r.mapcalc. Let me know what you think!

-- 
Ticket URL: <https://trac.osgeo.org/grass/ticket/3431#comment:7>
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