Skip to main content
Use the radians function in APL to convert an angle from degrees to radians. The conversion formula is radians = (π / 180) × angle_in_degrees. radians is useful as a preprocessing step before calling trigonometric functions such as sin, cos, or tan, which all expect their input in radians. If you have angle data in degrees, pass it through radians before applying any trigonometric operation.

​
For users of other query languages

If you come from other query languages, this section explains how to adjust your existing queries to achieve the same results in APL.
Splunk SPL doesn’t include a built-in radians() function. You compute the conversion manually by multiplying the degree value by pi() / 180.
| eval angle_rad = angle_deg * (pi() / 180)
In SQL Server and PostgreSQL, RADIANS() is a built-in function with identical semantics to the APL version.
SELECT RADIANS(angle_deg) AS angle_rad FROM logs

​
Usage

​
Syntax

radians(a)

​
Parameters

NameTypeRequiredDescription
arealYesThe angle in degrees to convert.

​
Returns

The angle in radians corresponding to the input degree value.

​
Example

Use radians to convert an angle in degrees to radians. Query 
print result = radians(180)
Run in Playground Output
result
3.1416
  • degrees: Converts radians to degrees. Use it for the inverse conversion after trigonometric computations.
  • pi: Returns the constant π. Use it when you want to compute radian conversions manually instead of using radians.
  • sin: Returns the sine of an angle in radians. Use radians to prepare degree inputs before calling sin.
  • cos: Returns the cosine of an angle in radians. Use radians to prepare degree inputs before calling cos.
  • tan: Returns the tangent of an angle in radians. Use radians to prepare degree inputs before calling tan.