Click or drag to resize

SpecialFunctionsEi Method

Exponential integral.

Namespace: CenterSpace.NMath.Core
Assembly: NMath (in NMath.dll) Version: 7.4
Syntax
public static double Ei(
	double x
)

Parameters

x  Double
Any real non-negative number.

Return Value

Double
The exponential integral at x.
Exceptions
ExceptionCondition
ArgumentOutOfRangeExceptionArgument x must a postive number.
Remarks
The exponential integral is,
C#
          +inf
            -     -t
           |     e
Ei(x) =    |    ---  dt
           |     t
          -
          -x
Note that exponential integral has a value of negative infinity at x = 0. The exponential integral is closely related to the incomplete gamma function.
See Also