3.201. __nv_lgamma

Prototype:

double @__nv_lgamma(double %x) 

Description:

Calculate the natural logarithm of the absolute value of the gamma function of the input argument x, namely the value of log e 0 e t t x 1 d t

Returns:

  • __nv_lgamma(1) returns +0.

  • __nv_lgamma(2) returns +0.

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

  • __nv_lgamma(x) returns + if x 0.

  • __nv_lgamma( ) returns .

  • __nv_lgamma( + ) 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