User Guide
278 CFML Language Reference
Atn
Returns the arctangent of a number. The arctangent is the angle whose tangent is
number.
See also Tan, Sin, Cos, and Pi.
Syntax Atn(
number
)
number
Tangent of the angle you want.
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.
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>