* patch lgamma.3:Better explain the use signgam
@ 2021-05-28 20:36 Radisson97
0 siblings, 0 replies; only message in thread
From: Radisson97 @ 2021-05-28 20:36 UTC (permalink / raw)
To: linux-man
Better explain the use signgam
Signed-off-by: Harms <wharms@bfs.de>
---
diff --git a/man3/lgamma.3 b/man3/lgamma.3
index 81f530074..5820a62f5 100644
--- a/man3/lgamma.3
+++ b/man3/lgamma.3
@@ -24,16 +24,19 @@ lgamma, lgammaf, lgammal, lgamma_r, lgammaf_r, lgammal_r \- log gamma function
.sp
Compile with -std=c99; link with \-lm.
.SH DESCRIPTION
-For the definition of the Gamma function, see
-.BR tgamma (3).
-.PP
The \fBlgamma()\fP function returns the natural logarithm of
the absolute value of the Gamma function.
The sign of the Gamma function is returned in the
external integer \fIsigngam\fP declared in
.IR <math.h> .
-It is 1 when the Gamma function is positive or zero, \-1
-when it is negative.
+The real gamma function can be computed as:
+.PP
+.RS
+gam = signgam * exp(gamma(x));
+.RE
+.PP
+For the definition of the Gamma function, see
+.BR tgamma (3).
.PP
Since using a constant location
.I signgam
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2021-05-28 20:36 patch lgamma.3:Better explain the use signgam Radisson97
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