XLPack 7.0
XLPack Numerical Library (Excel VBA) Reference Manual
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E1
E1_sub
Ei
Ei_sub
En
En_sub
Li
Li_sub
Spence
Spence_sub

◆ Ei_sub()

Sub Ei_sub ( Ret As  Double,
X As  Double,
Optional Info As  Long 
)

Exponential integral Ei(x) (Subroutine version)

Purpose
Computes the exponential integral Ei(x).
Ei(x) = -integral of exp(-t)/t dt [-x, inf] = -E1(-x)
E1
Function E1(X As Double, Optional Info As Long) As Double
Exponential integral E1(x)
Ei
Function Ei(X As Double, Optional Info As Long) As Double
Exponential integral Ei(x)
Parameters
[out]RetExponential integral Ei(x).
[in]XArgument x. (X <> 0)
[out]Info(Optional)
= 0: Successful exit.
= 1: Floating point range error.
Reference
boost/math/special_functions
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