libdevice User's Guide :: CUDA Toolkit Documentation

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libdevice User's Guide (PDF) - CUDA Toolkit v5.5 (older) - Last updated July 19, 2013 - 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 C, Table C-2.

Library Availability:

Compute 2.0: Yes

Compute 3.0: Yes

Compute 3.5: Yes

libdevice User's Guide (PDF) - CUDA Toolkit v5.5 (older) - Last updated July 19, 2013 - Send Feedback