Available with Spatial Analyst license.

## Summary

Calculates the inverse hyperbolic cosine of cells in a raster.

## Illustration

## 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 : 1 ≤ [in_value] < ∞

Note that any input value that is outside this domain will receive NoData on the output raster.

The Range is : -∞ < [out_value] < ∞

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

The input and output values for this tool are interpreted as unitless.

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

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

## Syntax

ACosH (in_raster_or_constant)

Parameter | Explanation | Data Type |

in_raster_or_constant | The input for which to calculate the inverse hyperbolic cosine values. 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 inverse hyperbolic cosine of the input values. | Raster |

## Code Sample

##### ACosH example 1 (Python window)

This example calculates the inverse hyperbolic cosine of the values in the input Grid raster and outputs an IMG raster.

```
import arcpy
from arcpy import env
from arcpy.sa import *
env.workspace = "C:/sapyexamples/data"
outACosH = ACosH("degs")
outACosH.save("C:/sapyexamples/output/outacosh.img")
```

##### ACosH example 2 (stand-alone script)

This example calculates the inverse hyperbolic cosine of the values in the input Grid raster.

```
# Name: ACosH_Ex_02.py
# Description: Calculates the inverse hyperbolic cosine 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 = "degs"
# Check out the ArcGIS Spatial Analyst extension license
arcpy.CheckOutExtension("Spatial")
# Execute ACosH
outACosH = ACosH(inRaster)
# Save the output
outACosH.save("C:/sapyexamples/output/outacosh")
```

## Environments

## Licensing Information

- ArcGIS for Desktop Basic: Requires Spatial Analyst
- ArcGIS for Desktop Standard: Requires Spatial Analyst
- ArcGIS for Desktop Advanced: Requires Spatial Analyst