summaryrefslogtreecommitdiffstats
path: root/man3/erf.3
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--man3/erf.327
1 files changed, 13 insertions, 14 deletions
diff --git a/man3/erf.3 b/man3/erf.3
index ed7f7f0..1e12bba 100644
--- a/man3/erf.3
+++ b/man3/erf.3
@@ -13,7 +13,7 @@
.\" Modified 2002-07-27 by Walter Harms
.\" (walter.harms@informatik.uni-oldenburg.de)
.\"
-.TH erf 3 2023-07-20 "Linux man-pages 6.05.01"
+.TH erf 3 2023-10-31 "Linux man-pages 6.7"
.SH NAME
erf, erff, erfl \- error function
.SH LIBRARY
@@ -22,24 +22,24 @@ Math library
.SH SYNOPSIS
.nf
.B #include <math.h>
-.PP
+.P
.BI "double erf(double " x );
.BI "float erff(float " x );
.BI "long double erfl(long double " x );
-.PP
+.P
.fi
.RS -4
Feature Test Macro Requirements for glibc (see
.BR feature_test_macros (7)):
.RE
-.PP
+.P
.BR erf ():
.nf
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
.fi
-.PP
+.P
.BR erff (),
.BR erfl ():
.nf
@@ -51,7 +51,7 @@ Feature Test Macro Requirements for glibc (see
These functions return the error function of
.IR x ,
defined as
-.PP
+.P
.in +4n
.EX
erf(x) = 2/sqrt(pi) * integral from 0 to x of exp(\-t*t) dt
@@ -61,20 +61,20 @@ erf(x) = 2/sqrt(pi) * integral from 0 to x of exp(\-t*t) dt
On success, these functions return the value of the error function of
.IR x ,
a value in the range [\-1,\ 1].
-.PP
+.P
If
.I x
is a NaN, a NaN is returned.
-.PP
+.P
If
.I x
is +0 (\-0), +0 (\-0) is returned.
-.PP
+.P
If
.I x
is positive infinity (negative infinity),
+1 (\-1) is returned.
-.PP
+.P
If
.I x
is subnormal,
@@ -85,7 +85,7 @@ See
.BR math_error (7)
for information on how to determine whether an error has occurred
when calling these functions.
-.PP
+.P
The following errors can occur:
.TP
Range error: result underflow (\fIx\fP is subnormal)
@@ -95,7 +95,7 @@ Range error: result underflow (\fIx\fP is subnormal)
An underflow floating-point exception
.RB ( FE_UNDERFLOW )
is raised.
-.PP
+.P
These functions do not set
.IR errno .
.\" It is intentional that these functions do not set errno for this case
@@ -116,12 +116,11 @@ T{
.BR erfl ()
T} Thread safety MT-Safe
.TE
-.sp 1
.SH STANDARDS
C11, POSIX.1-2008.
.SH HISTORY
C99, POSIX.1-2001.
-.PP
+.P
The variant returning
.I double
also conforms to