expm1f(3) [opendarwin man page]

EXP(3)							   BSD Library Functions Manual 						    EXP(3)

NAME

     exp, exp2, expm1 -- exponential functions

SYNOPSIS

     #include <math.h>

     double
     exp(double x);

     float
     expf(float x);

     double
     exp2(double x);

     float
     exp2f(float x);

     double
     expm1(double x);

     float
     expm1f(float x);

DESCRIPTION

     The exp() function computes e**x, the base-e exponential of x.

     The exp2() function computes 2**x, the base-2 exponential of x.

     The expm1() function computes the base-e exponential of x , minus 1 accurately even for very small values of x.

SPECIAL VALUES

     exp(+-0) and exp2(+-0) return 1.

     exp(-infinity) and exp2(-infinity) return +0.

     exp(+infinity) and exp2(+infinity) return +infinity.

     expm1(+-0) returns +-0.

     expm1(-infinity) returns -1.

     expm1(+infinity) returns +infinity.

     For all these functions, a range error occurs if the magnitude of x is too large.

SEE ALSO

     math(3), infnan(3)

STANDARDS

     The exp() , expf() , exp2() , exp2f() , expm1() , and expm1f() functions conform to ISO/IEC 9899:1999(E).

4th Berkeley Distribution					 January 30, 2003					 4th Berkeley Distribution

EXP(3)							   BSD Library Functions Manual 						    EXP(3)

NAME

     exp, expf, exp2, exp2f, expm1, expm1f, -- exponential functions

LIBRARY

     Math Library (libm, -lm)

SYNOPSIS

     #include <math.h>

     double
     exp(double x);

     float
     expf(float x);

     double
     exp2(double x);

     float
     exp2f(float x);

     double
     expm1(double x);

     float
     expm1f(float x);

DESCRIPTION

     The exp() and the expf() functions compute the base e exponential value of the given argument x.

     The exp2(), and exp2f() functions compute the base 2 exponential of the given argument x.

     The expm1() and the expm1f() functions computes the value exp(x)-1 accurately even for tiny argument x.

RETURN VALUES

     These functions will return the appropriate computation unless an error occurs or an argument is out of range.  The functions exp() and
     expm1() detect if the computed value will overflow, set the global variable errno to ERANGE and cause a reserved operand fault on a VAX.

SEE ALSO

     math(3)

STANDARDS

     The exp() functions conform to ANSI X3.159-1989 (``ANSI C89'').  The exp2(), exp2f(), expf(), expm1(), and expm1f() functions conform to
     ISO/IEC 9899:1999 (``ISO C99'').

HISTORY

     The exp() functions appeared in Version 6 AT&T UNIX.  The expm1() function appeared in 4.3BSD.

BSD
								September 13, 2011							       BSD