ArcMap

Exp

Available with Spatial Analyst license.

Summary

Calculates the base e exponential of the cells in a raster.

Illustration

Exp illustration
OutRas = Exp(InRas1)

Usage

  • Input values can be integer or float, and can be negative as well as positive.

    You can review some results for both positive and negative floating-point input values in the examples of output values from the Exponential tools.

  • The base e exponential is the most commonly used exponential function.

  • Input values less than or equal to -745 will be set to NoData in the output, because these values cannot be accurately represented by 32-bit floating-point numbers.

  • The output raster from this tool is always floating-point type, regardless of the input value type.

  • Output values from this tool are always positive.

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

Syntax

Exp (in_raster_or_constant)
ParameterExplanationData Type
in_raster_or_constant

The input values for which to find the base e exponential.

In order 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

NameExplanationData Type
out_raster

The output raster.

The cell values are the base e exponential of the input values.

Raster

Code sample

Exp example 1 (Python window)

This example calculates the base e exponential of the input raster values, and returns the result as a TIFF raster.

import arcpy
from arcpy import env
from arcpy.sa import *
env.workspace = "C:/sapyexamples/data"
outExp = Exp("landuse")
outExp.save("C:/sapyexamples/output/outexp.tif")
Exp example 2 (stand-alone script)

This example calculates the base e exponential of the input raster values.

# Name: Exp_Ex_02.py
# Description: Calculates the base e exponential of cells in a raster
# 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 = "landuse"

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

# Execute Exp
outExp = Exp(inRaster)

# Save the output 
outExp.save("C:/sapyexamples/output/outexp")

Environments

Licensing information

  • ArcGIS Desktop Basic: Requires Spatial Analyst
  • ArcGIS Desktop Standard: Requires Spatial Analyst
  • ArcGIS Desktop Advanced: Requires Spatial Analyst

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