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Functions and CALL Routines

IBESSEL Function



Returns the value of the modified Bessel function.
Category: Mathematical

Syntax
Arguments
Details
Examples

Syntax

IBESSEL(nu,x,kode)


Arguments

nu

specifies a numeric constant, variable, or expression.

Range: nu [ge] 0
x

specifies a numeric constant, variable, or expression.

Range: x [ge] 0
kode

is a numeric constant, variable, or expression that specifies a nonnegative integer.


Details

The IBESSEL function returns the value of the modified Bessel function of order nu evaluated at x (Abramowitz, Stegun 1964; Amos, Daniel, Weston 1977). When kode equals 0, the Bessel function is returned. Otherwise, the value of the following function is returned:

[equation]


Examples

SAS Statements Results
x=ibessel(2,2,0);
0.6889484477
x=ibessel(2,2,1);
0.0932390333

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