expint-package {expint} | R Documentation |
Exponential Integral and Incomplete Gamma Function
Description
The exponential integrals ,
,
and
, and the incomplete gamma function
that is defined for negative values of its first argument.
Details
The exponential integral
and the incomplete gamma function
are closely related functions that arise in various fields of mathematics.
expint is a small package that provides R functions to compute the exponential integral and the incomplete gamma function.
Most conveniently for R package developers, the package also gives access to the underlying C workhorses through an API; see the package vignette for instructions.
The C routines are adapted versions of those of the GNU Scientific Library https://www.gnu.org/software/gsl/.
Author(s)
Vincent Goulet vincent.goulet@act.ulaval.ca
References
Abramowitz, M. and Stegun, I. A. (1972), Handbook of Mathematical Functions, Dover.
See Also
expint
for the exponential integral family of functions.
gammainc
for the incomplete gamma function.
vignette("expint")
for a detailed presentation of the package.