[GRASS-dev] [GRASS GIS] #2986: r.mapcalc with same variable on LHS and RHS

GRASS GIS trac at osgeo.org
Thu May 5 11:39:46 PDT 2016

#2986: r.mapcalc with same variable on LHS and RHS
  Reporter:  mankoff      |      Owner:  grass-dev@…
      Type:  defect       |     Status:  closed
  Priority:  major        |  Milestone:  7.0.4
 Component:  Docs         |    Version:  7.0.3
Resolution:  fixed        |   Keywords:  r.mapcalc
       CPU:  Unspecified  |   Platform:  Unspecified

Comment (by glynn):

 Replying to [comment:10 mankoff]:
 > Would it be possible to support this by making {{{r.mapcalc}}} a
 wrapper, which replaces the {{{LHS}}} with something unique (if it is
 detected on the {{{RHS}}}, and then as a final step, setting the user
 {{{result}}} to the LHS-unique variable?
 It can't realistically be implemented as a wrapper, and I'm not sure that
 the behaviour would even be desirable. If change is warranted, it would be
 better to just check for the situation where an output map will overwrite
 any of the input maps, and report it as an error.

Ticket URL: <https://trac.osgeo.org/grass/ticket/2986#comment:11>
GRASS GIS <https://grass.osgeo.org>

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