# Negate (Spatial Analyst)

Available with Spatial Analyst license.

Available with Image Analyst license.

## Summary

Changes the sign (multiplies by -1) of the cell values of the input raster on a cell-by-cell basis.

## Usage

• If the input is integer, the output raster will be integer type. If the input is floating point, the output raster will be floating point.

• If the input is a multiband raster, the output will be a multiband raster. The tool will perform the operation on each band in the input.

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

• In ArcPy, if the input is a multidimensional raster, all slices from all variables will be processed, and the output will be a multidimensional raster.

• See Analysis environments and Spatial Analyst for additional details on the geoprocessing environments that apply to this tool.

## Parameters

 Label Explanation Data Type Input raster or constant value The input raster to be negated (multiplied by -1).To use a number as an input for this parameter, the cell size and extent must first be set in the environment. Raster Layer; Constant

### Return Value

 Label Explanation Data Type Output raster The output raster.The cell values are the input values negated (multiplied by -1). Raster

`Negate(in_raster_or_constant)`
 Name Explanation Data Type in_raster_or_constant The input raster to be negated (multiplied by -1).To use a number as an input for this parameter, 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 input values negated (multiplied by -1). Raster

### Code sample

Negate example 1 (Python window)

This example changes the sign of the values in the input raster and outputs a Grid raster.

``````import arcpy
from arcpy import env
from arcpy.sa import *
env.workspace = "C:/sapyexamples/data"
outNegate = Negate("degs")
outNegate.save("C:/sapyexamples/output/outneg")``````
Negate example 2 (stand-alone script)

This example changes the sign of the values in the input raster and outputs a Grid raster.

``````# Name: Negate_Ex_02.py
# Description: Changes the sign (multiplies by -1) of the cell values
#              of the input raster on a cell-by-cell basis
# Requirements: Spatial Analyst Extension

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

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

# Set local variables
inRaster = "degs"

# Execute Negate
outNegate = Negate(inRaster)

# Save the output
outNegate.save("C:/sapyexamples/output/outnegate")``````

## Licensing information

• Basic: Requires Spatial Analyst or Image Analyst
• Standard: Requires Spatial Analyst or Image Analyst
• Advanced: Requires Spatial Analyst or Image Analyst