[GRASS-user] mapcalculator error on grass through R (spgrass6)

GRASS GRASS user
1

​
Hello all:

I’m using grass through R, however I came across an error, while using a function that uses mapcalculator:

Error in system(cmd0, intern = TRUE) : ‘r.mapcalculator.exe’ not found
Error in parseGRASS(cmd, legacyExec = legacyExec) :
r.mapcalculator not found

I initiated the grass session by doing:

initGRASS(gisBase = ‘C:/Program Files (x86)/GRASS GIS 7.0.0beta1’, home=tempdir(), override=TRUE)

I can see that the maps are in the mapset, because when I do:

execGRASS(“g.mlist”, parameters = list(type = “rast”))

I see the list of map names.

Any help?

Already tried to re-install grass, and installed the last version of it.

Thanks,

Frederico

ᐧ

2

Frederico Mestre wrote

Error in system(cmd0, intern = TRUE) : 'r.mapcalculator.exe' not found
Error in parseGRASS(cmd, legacyExec = legacyExec) :
  r.mapcalculator not found

?

here in grass trunk it is: r.mapcalc.exe

-----
best regards
Helmut
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3

On Wed, Oct 15, 2014 at 6:30 PM, Frederico Mestre <
mestre.frederico@gmail.com> wrote:

​
Hello all:

I'm using grass through R, however I came across an error, while using a
function that uses mapcalculator:

Error in system(cmd0, intern = TRUE) : 'r.mapcalculator.exe' not found
Error in parseGRASS(cmd, legacyExec = legacyExec) :
  r.mapcalculator not found

The right module for raster algebra is r.mapcalc.

r.mapcalculator is a sh script used by QGIS Processing and similar tools to
help with passing raster maps to GRASS and back. spgrass6 is not doing
anything like this as far as I know, so the standard r.mapcalc is the
module to use.

Perhaps the names are little confusing. Also the fact that r.mapcalculator
is sh script in GRASS GIS 7 is quite surprising.

Anyway, r.mapcalc should solve your problem.

I initiated the grass session by doing:

initGRASS(gisBase = 'C:/Program Files (x86)/GRASS GIS 7.0.0beta1',
home=tempdir(), override=TRUE)

I can see that the maps are in the mapset, because when I do:

execGRASS("g.mlist", parameters = list(type = "rast"))

I see the list of map names.

Any help?

Already tried to re-install grass, and installed the last version of it.

Thanks,

Frederico
ᐧ

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