# CFLib.org – Common Function Library Project

## Asinh(x)

##### Last updated November 29, 2001

Version: 1 | Requires: CF5 | Library: MathLib

Description:
Returns the inverse hyberbolic sine of a value. All angles are expressed in radians.

Return Values:

Example:

``````<CFSET x=0.5>
<CFOUTPUT>
Given x=0.5<BR>
The Asinh of #x# is: #Asinh(x)# radians
</CFOUTPUT>``````

Parameters:

Name Description Required
x Any real number. Yes

Full UDF Source:

``````/**
* Returns the inverse hyberbolic sine of a value.
*
* @param x 	 Any real number.
* @return Returns an angle in radians.
* @author Joel Cox (jlcox@goodyear.com)
* @version 1, November 29, 2001
*/
function Asinh(x)
{
Var RetVal = 0;
Var Neg = False;
if (x EQ 0) {
RetVal = 0;
}
else {
if (X LT 0)
Neg = True;
x = Abs(x);
if (x GT 1.0e10)
RetVal = Log(2) + Log(X);
else {
RetVal = x^2;
RetVal = Log(x + RetVal / (1 + Sqr(1 + RetVal)) + 1);
}
if (Neg)
RetVal = -RetVal;
}
Return(RetVal);
}``````

date2ExcelDate
May 5, 2016

CapFirst
April 25, 2016