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\" from: @(#)exp.3 6.12 (Berkeley) 7/31/91
\" $FreeBSD: src/lib/msun/man/exp.3,v 1.24 2008/01/18 21:43:00 das Exp $
\" $NetBSD: exp.3,v 1.33 2024/01/26 19:27:30 nros Exp $
\"
Dd January 24, 2024
Dt EXP 3
Os
Sh NAME
Nm exp ,
Nm expf ,
Nm expl ,
\" The sorting error is intentional. exp and expf should be adjacent.
Nm exp2 ,
Nm exp2f ,
Nm exp2l ,
Nm expm1 ,
Nm expm1f
Nm expm1l
Nd exponential functions
Sh LIBRARY
Lb libm
Sh SYNOPSIS
In math.h
Ft double
Fn exp "double x"
Ft float
Fn expf "float x"
Ft long double
Fn expf "long double x"
Ft double
Fn exp2 "double x"
Ft float
Fn exp2f "float x"
Ft long double
Fn exp2l "long double x"
Ft double
Fn expm1 "double x"
Ft float
Fn expm1f "float x"
Ft long double
Fn expm1l "long double x"
Sh DESCRIPTION
The
Fn exp ,
Fn expf ,
and
Fn expl
functions compute the base
Ms e
exponential value of the given argument
Fa x .
Pp
The
Fn exp2 ,
Fn exp2f ,
and
Fn exp2l
functions compute the base 2 exponential of the given argument
Fa x .
Pp
The
Fn expm1 ,
Fn expm1f
and
Fn expm1l
functions compute the value exp(x)\-1 accurately even for tiny argument
Fa x .
Sh RETURN VALUES
These functions will return the appropriate computation unless an error
occurs or an argument is out of range.
The functions
Fn exp
and
Fn expm1
detect if the computed value will overflow,
set the global variable
Va errno
to
Er ERANGE
and cause a reserved operand fault on a
Tn VAX .
Sh SEE ALSO
Xr math 3
Sh STANDARDS
The
Fn exp
function conforms to
St -ansiC .
The
Fn exp2 ,
Fn exp2f ,
Fn exp2l ,
Fn expf ,
Fn expl ,
Fn expm1 ,
Fn expm1f ,
and
Fn expm1l
functions conform to
St -isoC-99 .
Sh HISTORY
The
Fn exp
functions appeared in
At v1 .
The
Fn expm1
function appeared in
Bx 4.3 .
