s18ce returns a value of the scaled modified Bessel function e - x I 0 x
Syntax
| C# |
|---|
public static double s18ce( double x ) |
| Visual Basic (Declaration) |
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Public Shared Function s18ce ( _ x As Double _ ) As Double |
| Visual C++ |
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public: static double s18ce( double x ) |
| F# |
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static member s18ce : x:float -> float |
Parameters
- x
- Type: System..::.Double
On entry: the argument
Return Value
s18ce returns a value of the scaled modified Bessel function e - x I 0 x
Description
s18ce evaluates an approximation to e - x I 0 x I 0 e - x I 0 x
The method uses the same Chebyshev expansions as s18ae, which returns the unscaled value of I 0 x
References
Error Indicators and Warnings
None.
Accuracy
Relative errors in the argument are attenuated when propagated into the function value. When the accuracy of the argument is essentially limited by the machine precision, the accuracy of the function value will be similarly limited by at most a small multiple of the machine precision.
Further Comments
None.
Example
This example reads values of the argument x x
Example program (C#): s18cee.cs
