# TanH (Spatial Analyst)

## Summary

Calculates the hyperbolic tangent of cells in a raster.

## Illustration

 OutRas = TanH(InRas)

## Usage

• In mathematics, all Trigonometric functions have a defined range of valid input values, called the domain. The output values from each function also has a defined range. For this tool:

• The Domain is : -∞ < [in_value] < ∞

• The Range is : -1 < [out_value] < 1

Note that here -∞ and ∞ represent the smallest negative and largest positive value supported by the particular raster format, respectively.

• Output values are always floating point, regardless of the input data type.

• The input and output values of TanH are interpreted as unitless.

## Syntax

TanH (in_raster_or_constant)
 Parameter Explanation Data Type in_raster_or_constant The input to calculate the hyperbolic tangent values for. 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

 Name Explanation Data Type out_raster The output raster. The values are the hyperbolic tangent of the input values. Raster

## Code Sample

TanH example 1 (Python window)

This example calculates the hyperbolic tangent of the values in the input GRID raster.

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

This example calculates the hyperbolic tangent of the values in the input GRID raster and outputs an IMG raster.

```# Name: TanH_Ex_02.py
# Description: Calculates the hyperbolic tangent of cells in a raster
# 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
inRaster = "degs"

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

# Execute TanH
outTanH = TanH(inRaster)

# Save the output
outTanH.save("C:/sapyexamples/output/outtanh.img")```

## Licensing Information

ArcView: Requires Spatial Analyst
ArcEditor: Requires Spatial Analyst
ArcInfo: Requires Spatial Analyst

6/29/2011