__device__ double atanh ( double  x  ) 

Calculate the arc hyperbolic tangent of the input argument x (measured in radians).

Returns:
  • atanh($\pm 0$) returns $\pm 0$.
  • atanh($\pm 1$) returns $\pm \infty$.
  • atanh(x) returns NaN for x outside interval [-1, 1].
Note:
For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-2.


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