r.mapcalc.simple(1grass) | Grass User's Manual | r.mapcalc.simple(1grass) |
r.mapcalc.simple - Calculates a new raster map from a simple r.mapcalc expression.
raster, algebra, simple
r.mapcalc.simple
r.mapcalc.simple --help
r.mapcalc.simple [-sqc] expression=string
[a=name] [b=name] [c=name]
[d=name] [e=name] [f=name]
output=name [seed=integer] [--overwrite]
[--help] [--verbose] [--quiet] [--ui]
r.mapcalc.simple provides a wrapper to r.mapcalc. Up to 6 maps can be combined using simple expressions.
The general syntax for the expression follows r.mapcalc expression format, for example, A + B or exp(A + B) are valid. The variables A, B, ..., F represent raster maps which are provided as options a, b, ..., f.
The result name, i.e. the output raster map, is provided using the option output and, unlike r.mapcalc it is not part of the expression.
This module is meant for convenience (for users and programmers) while the r.mapcalc module is a better choice for more complex expressions and advanced usage.
Differences to r.mapcalc module:
r.mapcalc.simple expression="0" output=zeros r.mapcalc.simple expression="1" output=ones r.mapcalc.simple expression="2" output=twos
r.mapcalc.simple expression="A + B + C" a=zeros b=ones c=twos output=result1
r.mapcalc.simple expression="(A * B) / 2 + 3 * C" a=zeros b=ones c=twos output=result2
Addition:
A + B
No spaces around operators are not recommended for readability,
but allowed in the expression:
A+B
More complex expression with a function:
exp(A+C)+(B-2)*7
r.mapcalc, r3.mapcalc, t.rast.mapcalc, g.region
Vaclav Petras, NCSU GeoForAll Lab
Michael Barton, Arizona State University (updated to GRASS 5.7)
R. Brunzema (original 5.0 Bash version)
Last changed: $Date: 2018-12-11 07:28:51 +0100 (Tue, 11 Dec 2018) $
Available at: r.mapcalc.simple source code (history)
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