__device__ float atanf ( float  x  ) 

Calculate the principal value of the arc tangent of the input argument x.

Returns:
Result will be in radians, in the interval [-$\pi/2$, +$\pi/2$].
  • atanf(0) returns +0.
Note:
For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.


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