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| Commit | Line | Data |
|---|---|---|
| e6817382 BJ |
1 | .TH GAMMA 3M |
| 2 | .SH NAME | |
| 3 | gamma \- log gamma function | |
| 4 | .SH SYNOPSIS | |
| 5 | .B #include <math.h> | |
| 6 | .PP | |
| 7 | .B double gamma(x) | |
| 8 | .br | |
| 9 | .B double x; | |
| 10 | .SH DESCRIPTION | |
| 11 | .I Gamma | |
| 12 | returns | |
| 13 | ln |\(*G(|\fIx\fR|)|. | |
| 14 | The sign of | |
| 15 | \(*G(|\fIx\fR|) | |
| 16 | is returned in the external integer | |
| 17 | .IR signgam . | |
| 18 | The following C program might be | |
| 19 | used to calculate | |
| 20 | \(*G: | |
| 21 | .PP | |
| 22 | y = gamma(x); | |
| 23 | .br | |
| 24 | if (y > 88.) | |
| 25 | .br | |
| 26 | error( ); | |
| 27 | .br | |
| 28 | y = exp(y); | |
| 29 | .br | |
| 30 | if(signgam) | |
| 31 | .br | |
| 32 | y = \-y; | |
| 33 | .SH DIAGNOSTICS | |
| 34 | A huge value is returned for negative integer arguments. | |
| 35 | .SH BUGS | |
| 36 | There should be a positive indication of error. |