libdevice User's Guide :: CUDA Toolkit Documentation

This document includes math equations (highlighted in red) which are best viewed with Firefox version 4.0 or higher, or another MathML-aware browser. There is also a PDF version of this document.

libdevice User's Guide (PDF) - v6.0 (older) - Last updated February 13, 2014 - Send Feedback -

3.288. __nv_tgammaf

Prototype:

float @__nv_tgammaf(float %x)

Description:

Calculate the gamma function of the input argument x, namely the value of $\int_{0}^{\infty} e^{- t} t^{x - 1} d t$ .

Returns:

__nv_tgammaf( $\pm 0$ ) returns $\pm \infty$ .
__nv_tgammaf(2) returns +0.
__nv_tgammaf(x) returns $\pm \infty$ if the correctly calculated value is outside the double floating point range.
__nv_tgammaf(x) returns NaN if x < 0.
__nv_tgammaf( $- \infty$ ) returns NaN.
__nv_tgammaf( $+ \infty$ ) returns $+ \infty$ .

Note:

For accuracy information for this function see the CUDA C Programming Guide, Appendix D.1, Table 6.

Library Availability:

Compute 2.0: Yes

Compute 3.0: Yes

Compute 3.5: Yes