expm1(3M)expm1(3M)NAMEexpm1(), expm1f(), expm1l(), expm1w(), expm1q() - exponential minus 1
functions
SYNOPSIS
HP Integrity Server Only
DESCRIPTION
The function is equivalent to - 1, but may be more accurate for very
small values of x.
The and functions are useful to guarantee that financial calculations
of (((1+x)**n)-1)/x are accurate when x is very small, namely:
The preceding example might be applicable when calculating small daily
interest rates.
See also
Integrity Server Only
is a version of it takes a argument and returns a result.
is a version of it takes a argument and returns a result.
is an version of it takes an argument and returns an result.
is equivalent to on HP-UX systems.
USAGE
To use these functions, compile either with the default option or with
the and options.
To use (for Integrity servers) or compile also with the option.
Make sure your program includes and link in the math library by speci‐
fying on the compiler or linker command line.
For more information, see the at the following site:
RETURN VALUE
If x is +INFINITY, returns +INFINITY.
If x is −INFINITY, returns -1.0.
If x is NaN, returns NaN.
returns infinity (equal to in lieu of a value whose magnitude is too
large, and raises the overflow and inexact exceptions.
When it raises no other exception, whether raises the inexact exception
is unspecified.
ERRORS
If the correct value would overflow, sets to [ERANGE].
Integrity Server Only
HP-UX functions on Integrity server do not set by default. For set‐
ting, compile with the option.
SEE ALSOannuity(3M), compound(3M), exp(3M), log1p(3M), math(5).
STANDARDS CONFORMANCE
: XPG4.2, ISO/IEC C99 (including Annex F, ``IEC 60559 floating-point
arithmetic'')
: ISO/IEC C99 (including Annex F, ``IEC 60559 floating-point arith‐
metic'')
expm1(3M)