CFLib.org – Common Function Library Project

Description:
Returns the inverse secant of an angle. Returns the string "undefined" if zero (0) is passed. All angles are expressed in radians.

Return Values:
Returns a numeric value or string.

Example:

<CFSET x=(Pi()/2)>

<CFOUTPUT>
Given x=#x#:<BR>
Asec=#Asec(x)#
</CFOUTPUT>

Parameters:

Full UDF Source:

/**
 * Returns the inverse secant of an angle.
 * 
 * @param x      Angle in radians. 
 * @return Returns a numeric value or string. 
 * @author Rob Brooks-Bilson (rbils@amkor.com) 
 * @version 1, November 29, 2001 
 */
function Asec(x){
  if (x eq 0)
    return "undefined";
  else
    return Atn(Sqr(x*x-1))+(Sgn(x)-1)*1.570796;
}