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This method returns the arctangent in radians of a number. The atan method returns a numeric value between -pi/2 and pi/2 radians.
Math.atan( x ) ; |
Here is the detail of parameters:
x : A number.
Returns the arctangent in radians of a number.
<html> <head> <title>JavaScript Math atan() Method</title> </head> <body> <script type="text/javascript"> var value = Math.atan(-1); document.write("First Test Value : " + value ); var value = Math.atan(.5); document.write("<br />Second Test Value : " + value ); var value = Math.atan(30); document.write("<br />Third Test Value : " + value ); var value = Math.atan("string"); document.write("<br />Fourth Test Value : " + value ); </script> </body> </html> |
This will produce following result:
First Test Value : -0.7853981633974483 Second Test Value : 0.4636476090008061 Third Test Value : 1.5374753309166493 Fourth Test Value : NaN |
To understand it in better way you can Try it yourself.
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