# Minus (Spatial Analyst)

## Summary

Subtracts the value of the second input raster from the value of the first input raster on a cell-by-cell basis.

## Illustration

 OutRas = Minus (InRas1, InRas2)

## Usage

• The order of inputs is relevant for this tool.

• If both inputs are integer, the output will be an integer raster; otherwise, it will be a floating-point raster.

• In Map Algebra, the equivalent operator symbol for this tool is "-" (link).

## Syntax

Minus (in_raster_or_constant1, in_raster_or_constant2)
 Parameter Explanation Data Type in_raster_or_constant1 The input from which to subtract the values in the second input. A number can be used as an input for this parameter, provided a raster is specified for the other parameter. To be able to specify a number for both inputs, the cell size and extent must first be set in the environment. Raster Layer | Constant in_raster_or_constant2 The input values to subtract from the values in the first input. A number can be used as an input for this parameter, provided a raster is specified for the other parameter. To be able to specify a number for both inputs, the cell size and extent must first be set in the environment. Raster Layer | Constant

#### Return Value

 Name Explanation Data Type out_raster The output raster. The cell values are the result of subtracting the second input from the first. Raster

## Code Sample

Minus example 1 (Python window)

This example subtracts the values of the second input raster from the first.

```import arcpy
from arcpy import env
from arcpy.sa import *
env.workspace = "C:/sapyexamples/data"
outMinus = Minus("degs", "negs")
outMinus.save("C:/sapyexamples/output/outminus")```
Minus example 2 (stand-alone script)

This example subtracts the values of the second input raster from the first.

```# Name: Minus_Ex_02.py
# Description: Subtracts the value of the second input raster from the
#              value of the first input raster on a cell-by-cell basis
# Requirements: Spatial Analyst Extension
# Author: ESRI

# Import system modules
import arcpy
from arcpy import env
from arcpy.sa import *

# Set environment settings
env.workspace = "C:/sapyexamples/data"

# Set local variables
inRaster1 = "degs"
inRaster2 = "negs"

# Check out the ArcGIS Spatial Analyst extension license
arcpy.CheckOutExtension("Spatial")

# Execute Minus
outMinus = Minus(inRaster1, inRaster2)

# Save the output
outMinus.save("C:/sapyexamples/output/outminus.tif")```

## Licensing Information

ArcView: Requires Spatial Analyst or 3D Analyst
ArcEditor: Requires Spatial Analyst or 3D Analyst
ArcInfo: Requires Spatial Analyst or 3D Analyst

6/29/2011