DragonFly On-Line Manual Pages


EXP(3)		      DragonFly Library Functions Manual		EXP(3)

NAME

exp, expf, expl, exp2, exp2f, exp2l, expm1, expm1f, expm1l, pow, powf -- exponential and power functions

LIBRARY

Math Library (libm, -lm)

SYNOPSIS

#include <math.h> double exp(double x); float expf(float x); long double expl(long double x); double exp2(double x); float exp2f(float x); long double exp2l(long double x); double expm1(double x); float expm1f(float x); long double expm1l(long double x); double pow(double x, double y); float powf(float x, float y);

DESCRIPTION

The exp(), expf(), and expl() functions compute the base e exponential value of the given argument x. The exp2(), exp2f(), and exp2l() functions compute the base 2 exponential of the given argument x. The expm1(), expm1f(), and the expm1l() functions compute the value exp(x)-1 accurately even for tiny argument x. The pow() and the powf() functions compute the value of x to the exponent y. ERROR (due to Roundoff etc.) The values of exp(0), expm1(0), exp2(integer), and pow(integer, integer) are exact provided that they are representable. Otherwise the error in these functions is generally below one ulp.

RETURN VALUES

These functions will return the appropriate computation unless an error occurs or an argument is out of range. The functions pow(x, y) and powf(x, y) raise an invalid exception and return an NaN if x < 0 and y is not an integer.

NOTES

The function pow(x, 0) returns x**0 = 1 for all x including x = 0, infin- ity, and NaN . Previous implementations of pow may have defined x**0 to be undefined in some or all of these cases. Here are reasons for return- ing x**0 = 1 always: 1. Any program that already tests whether x is zero (or infinite or NaN) before computing x**0 cannot care whether 0**0 = 1 or not. Any program that depends upon 0**0 to be invalid is dubious any- way since that expression's meaning and, if invalid, its conse- quences vary from one computer system to another. 2. Some Algebra texts (e.g. Sigler's) define x**0 = 1 for all x, including x = 0. This is compatible with the convention that accepts a[0] as the value of polynomial p(x) = a[0]*x**0 + a[1]*x**1 + a[2]*x**2 +...+ a[n]*x**n at x = 0 rather than reject a[0]*0**0 as invalid. 3. Analysts will accept 0**0 = 1 despite that x**y can approach any- thing or nothing as x and y approach 0 independently. The reason for setting 0**0 = 1 anyway is this: If x(z) and y(z) are any functions analytic (expandable in power series) in z around z = 0, and if there x(0) = y(0) = 0, then x(z)**y(z) -> 1 as z -> 0. 4. If 0**0 = 1, then infinity**0 = 1/0**0 = 1 too; and then NaN**0 = 1 too because x**0 = 1 for all finite and infinite x, i.e., inde- pendently of x.

SEE ALSO

fenv(3), ldexp(3), log(3), math(3)

STANDARDS

These functions conform to ISO/IEC 9899:1999 (``ISO C99''). DragonFly 3.7 June 11, 2013 DragonFly 3.7