MACROMEDIA COLFUSION MX 7-CFML, Reference

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Atn 491
Atn
Description
Arctangent function. The arctangent is the angle whose tangent is number .
Returns
The arctangent, in radians, of a number.
Category
Mathematical functions
Function syntax
Atn ( number )
See also
Atn , Sin , ASin , Cos , ACos , Pi
Parameters
Usage
The range of the result is -
π
/2 to
π
/2 radians. To convert degrees to radians, multiply degrees by
π
/180. To convert radians to degrees, multiply radians by 180/
π
.
Example
<h3>Atn Example</h3>
<!--- output its Atn value --->
<cfif IsDefined("FORM.AtnNum")>
<cfif IsNumeric(FORM.AtnNum)>
Atn(<cfoutput>#FORM.AtnNum#</cfoutput>) is
<cfoutput>#Atn(FORM.AtnNum)# radians is #Atn(FORM.AtnNum * 180/PI())#
Degrees</cfoutput>
<cfelse>
<!--- if it is empty, output an error message --->
<h4>Enter a number</h4>
</cfif>
</cfif>
<form action = "evaltest.cfm" method="post">
<p>Enter 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>
Parameter Description
number Tangent of an angle