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Copyright (c) 2001, the Institute of Electrical
and Electronics Engineers, Inc. and The Open Group. All Rights Reserved.
Copyright (c) 1992, X/Open Company Limited.
All Rights Reserved.
Copyright (c) 1983 Regents of the University
of California. All rights reserved. The Berkeley software License Agreement
specifies the terms and conditions for redistribution.
Portions Copyright (c) 2006, Sun Microsystems,
Inc. All Rights Reserved.
Sun Microsystems, Inc. gratefully acknowledges The Open Group for permission to reproduce portions of its copyrighted documentation. Original documentation from The Open Group can be obtained online at
http://www.opengroup.org/bookstore/.
The Institute of Electrical and Electronics Engineers and The Open Group, have given us permission to reprint portions of their documentation. In the following statement, the phrase "this text" refers to portions of the system documentation. Portions of this text are reprinted and reproduced in electronic form in the Sun OS Reference Manual, from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between these versions and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html.
This notice shall appear on any product containing this material.
Copyright (c) 2001, the Institute of Electrical
and Electronics Engineers, Inc. and The Open Group. All Rights Reserved.
Copyright (c) 1992, X/Open Company Limited.
All Rights Reserved.
Copyright (c) 1983 Regents of the University
of California. All rights reserved. The Berkeley software License Agreement
specifies the terms and conditions for redistribution.
Portions Copyright (c) 2006, Sun Microsystems,
Inc. All Rights Reserved.
Sun Microsystems, Inc. gratefully acknowledges The Open Group for permission to reproduce portions of its copyrighted documentation. Original documentation from The Open Group can be obtained online at
http://www.opengroup.org/bookstore/.
The Institute of Electrical and Electronics Engineers and The Open Group, have given us permission to reprint portions of their documentation. In the following statement, the phrase "this text" refers to portions of the system documentation. Portions of this text are reprinted and reproduced in electronic form in the Sun OS Reference Manual, from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between these versions and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html.
This notice shall appear on any product containing this material.
erf 3M "12 Jul 2006" "SunOS 5.11" "Mathematical Library Functions"
NAME
erf, erff, erfl - error function
SYNOPSIS
c99 [ flag... ] file... -lm [ library... ] #include <math.h> double erf(double x);
float erff(float x);
long double erfl(long double x);
DESCRIPTION
These functions compute the error function of their argument x, defined as: 2/sqrt(pi)*intregral from 0 to x of exp(-t*t) dt
RETURN VALUES
Upon successful completion, these functions return the value of the error function.
If x is NaN, a NaN is returned.
If x is \(+-0, \(+-0 is returned.
If x is \(+-Inf, \(+-1 is returned.
If x is subnormal, 2/sqrt(\c \c ) * 2 is returned.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| Interface Stability | Standard |
| MT-Level | MT-Safe |
SEE ALSO
erfc(3M), feclearexcept(3M), fetestexcept(3M), isnan(3M), math.h(3HEAD), attributes(5), standards(5)