Sin
Calculates the sine of an angle that is entered in radians.
A number; the sine of the angle.
Sin(number)
|
Parameter |
Description |
|---|---|
| number |
Angle, in radians for which to calculate the sine. |
The range of the result is -1 to 1.
To convert degrees to radians, multiply degrees by p/180. To convert radians to degrees, multiply radians by 180/p.
Note: Because the function uses floating point arithmetic, it returns a very small number (such as 6.12323399574E-017) for angles that should produce 0. To test for a 0 value, check whether the value is less than 0.0000000000001.
<h3>Sin Example</h3>
<!--- Calculate sine if form has been submitted --->
<cfif IsDefined("FORM.sinNum")>
<!--- Make sure input is a number --->
<cfif IsNumeric(#FORM.sinNum#)>
<!--- Convert degrees to radians, call the Sin function. --->
<cfset sinValue=#Sin((Form.sinNum * PI()) / 180)#>
<!--- 0.0000000000001 is the function's precision limit.
If absolute value of returned sine value is
less, set result to 0 --->
<cfif Abs(sinValue) LT 0.0000000000001>
<cfset sinValue=0>
</cfif>
<cfoutput>
Sin(#FORM.sinNum#) = #sinValue#<br><br>
</cfoutput>
<cfelse>
<!--- If input is not a number, show an error message --->
<h4>You must enter a numeric angle in degrees.</h4>
</cfif>
</cfif>
<form action = "#CGI.script_name#" method="post">
Enter an angle in degrees to get its sine:
<br><input type = "Text" name = "sinNum" size = "15">
<br><br>
<input type = "Submit" name = "">
<input type = "RESET"
</form>