3.287. __nv_tgamma

Prototype:

double @__nv_tgamma(double %x) 

Description:

Calculate the gamma function of the input argument x, namely the value of 0 e t t x 1 d t .

Returns:

  • __nv_tgamma( ± 0 ) returns ± .

  • __nv_tgamma(2) returns +0.

  • __nv_tgamma(x) returns ± if the correctly calculated value is outside the double floating point range.

  • __nv_tgamma(x) returns NaN if x < 0.

  • __nv_tgamma( ) returns NaN.

  • __nv_tgamma( + ) returns + .

Note:

For accuracy information for this function see the CUDA C Programming Guide, Appendix D.1, Table 7.

Library Availability:

Compute 2.0: Yes

Compute 3.0: Yes

Compute 3.5: Yes