Atn

Returns the arctangent of a number. The arctangent is the angle whose tangent is number.

Syntax

Atn(number)

number

Tangent of the angle you want.

Usage

The range of the result is -/2 to /2 radians. To convert degrees to radians, multiply degrees by /180. To convert radians to degrees, multiply radians by 180/.

Examples

<!--- This snippet shows how to use Atn --->
<HTML>
<HEAD>
<TITLE>
Atn Example
</TITLE>
</HEAD>

<BODY BGCOLOR=silver>
<H3>Atn Example</H3>

<!--- output its Atn value --->
<CFIF IsDefined("FORM.AtnNum")>
    <CFIF IsNumeric(FORM.atnNum)>
        Atn(<CFOUTPUT>#FORM.atnNum#</CFOUTPUT>) =
          <CFOUTPUT>#Atn(FORM.atnNum)# radians =
            #Evaluate(Atn(FORM.atnNum * 180/PI())# 
              Degrees</CFOUTPUT>
    <CFELSE>
<!--- if it is empty, output an error message --->
        <H4>Please enter a number</H4>
    </CFIF>
</CFIF>

<FORM ACTION="atn.cfm" METHOD="POST">
<P>Type in a number to get its arctangent in Radians and Degrees
<BR><INPUT TYPE="Text" NAME="atnNum" size="25">
<P><INPUT TYPE="Submit" NAME=""> <INPUT TYPE="RESET">
</FORM>

</BODY>
</HTML>

CFML Language Reference
Chapter 2 : ColdFusion Functions