---
name: "r3.mapcalculator"
section: "1grass"
platform: "linux"
package: "grass-doc"
version: "6.4.4-1"
release: "Debian 8 (Jessie)"
platforms: ["linux"]
url: "https://new.carta.tech/r3.mapcalculator"
---

# r3.mapcalculator(1grass)

Calculates new grid3D volume from r3.mapcalc expression.

## NAME

**r3.mapcalculator**  - Calculates new grid3D volume from r3.mapcalc expression.

## KEYWORDS

## SYNOPSIS

**r3.mapcalculator**\
 **r3.mapcalculator help**\
 **r3.mapcalculator** \[-**eo**\]  \[**agrid**=*string*\]   \[**bgrid**=*string*\]   \[**cgrid**=*string*\]   \[**dgrid**=*string*\]   \[**egrid**=*string*\]   \[**fgrid**=*string*\]  **formula**=*string* **outfile**=*string*  \[**help**=*string*\]   \[--**verbose**\]  \[--**quiet**\]

### Flags:

- **-e**

  Expert mode (enter a set of r3.mapcalc expressions)

- **-o**

  Do not overwrite existing map

- **--verbose**

  Verbose module output

- **--quiet**

  Quiet module output

### Parameters:

- **agrid**=*string*

  A (grid3D file)

- **bgrid**=*string*

  B (grid3D file)

- **cgrid**=*string*

  C (grid3D file)

- **dgrid**=*string*

  D (grid3D file)

- **egrid**=*string*

  E (grid3D file)

- **fgrid**=*string*

  F (grid3D file)

- **formula**=*string*

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

- **outfile**=*string*

  Name for output grid3D volume

- **help**=*string*

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

## DESCRIPTION

*r3.mapcalculator* provides a GUI frontend to *r3.mapcalc*. Up to 5 maps can be combined using simple expressions. In the expert mode, it runs *r3.mapcalc* for more complex expressions. Enter an *r3.mapcalc* expression in the formula field using the format: A+C or exp(A+C)+(B-2)\*7 where A, B, C are 3D raster volumes 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 *r3.mapcalc* for more complex expressions.

## SEE ALSO

*r3.mapcalc*

## AUTHOR

Michael Barton, Arizona State University. Based on r.mapcalculator by R. Brunzema (r.brunzema@web.de)

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

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