pm_math1mexp Module Reference

This module contains procedures and generic interfaces for computing 1 - exp(x) more precisely for tiny x. More...

Data Types
interface	get1mexp
	Generate and return the expression 1 - exp(x) robustly (without numerical underflow). More...

Variables
character(*, SK), parameter	MODULE_NAME = "@pm_math1mexp"

Detailed Description

This module contains procedures and generic interfaces for computing 1 - exp(x) more precisely for tiny x.

This module is particularly useful for computing 1 - exp(x) when x is near or smaller than the computer precision of the desired real kind.
This precision is the value returned by the Fortran intrinsic epsilon() procedure.

See also

Beebe, 2002, Computation of expm1(x) = exp(x) − 1
getLog1p
get1mexp
getLogAddExp
getLogSubExp
getLogSumExp

Final Remarks ⛓

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Copyright

Computational Data Science Lab

Test:

test_pm_math1mexp

Author:

Amir Shahmoradi, Thursday 1:45 AM, August 22, 2019, Dallas, TX

Variable Documentation

MODULE_NAME

character(*, SK), parameter pm_math1mexp::MODULE_NAME = "@pm_math1mexp"

Definition at line 49 of file pm_math1mexp.F90.