---
name: "r.mapcalculator"
section: "1grass"
platform: "linux"
package: "grass-doc"
version: "6.4.4-1"
release: "Debian 8 (Jessie)"
platforms: ["linux"]
url: "https://new.carta.tech/r.mapcalculator"
---

# r.mapcalculator(1grass)

Calculate new raster map from a r.mapcalc expression.

## NAME

**r.mapcalculator**  - Calculate new raster map from a r.mapcalc expression.

## KEYWORDS

## SYNOPSIS

**r.mapcalculator**\
 **r.mapcalculator help**\
 **r.mapcalculator** \[-**eo**\]  \[**amap**=*string*\]   \[**bmap**=*string*\]   \[**cmap**=*string*\]   \[**dmap**=*string*\]   \[**emap**=*string*\]   \[**fmap**=*string*\]  **formula**=*string* **outfile**=*string*  \[**help**=*string*\]   \[--**overwrite**\]  \[--**verbose**\]  \[--**quiet**\]

### Flags:

- **-e**

  Expert mode (enter a set of r.mapcalc expressions)

- **-o**

  Do not overwrite existing map

- **--overwrite**

  Allow output files to overwrite existing files

- **--verbose**

  Verbose module output

- **--quiet**

  Quiet module output

### Parameters:

- **amap**=*string*

  A

- **bmap**=*string*

  B

- **cmap**=*string*

  C

- **dmap**=*string*

  D

- **emap**=*string*

  E

- **fmap**=*string*

  F

- **formula**=*string*

  Formula (e.g. A-B or A\*C+B)

- **outfile**=*string*

  Name for output raster map

- **help**=*string*

  Show help\
   Options: *-,help,man*\
   Default: *-*

## DESCRIPTION

*r.mapcalculator* provides a GUI frontend to *r.mapcalc*. Up to 5 maps can be combined using simple expressions. In the expert mode, it runs *r.mapcalc* for more complex expressions. Enter an *r.mapcalc* expression in the formula field using the format: A+C or exp(A+C)+(B-2)\*7 where A, B, C are raster maps entered in the A field, B field, and C field.

Do not enter output file in the formula field: correct: A+B; incorrect: newfile = A+B. Use no spaces or blanks.

Expert mode runs *r.mapcalc* for more complex expressions.

## SEE ALSO

*r.mapcalc*

## AUTHOR

R. Brunzema (r.brunzema@web.de)\
 Updated to GRASS 5.7 by Michael Barton, Arizona State University

*Last changed: $Date: 2011-11-08 10:42:51 +0100 (Tue, 08 Nov 2011) $*

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