ACosH (Spatial Analyst)

Summary

Calculates the inverse hyperbolic cosine of cells in a raster.

Illustration

OutRas = ACosH(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 : 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 in ACosH are interpreted as unitless.

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

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
# 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 ACosH
outACosH = ACosH(inRaster)

# Save the output 
outACosH.save("C:/sapyexamples/output/outacosh")

Environments

Cell Size, Current Workspace, Mask, Output Coordinate System, Extent, Scratch Workspace, Snap Raster

Licensing Information

ArcView: Requires Spatial Analyst

ArcEditor: Requires Spatial Analyst

ArcInfo: Requires Spatial Analyst