BESSEL returns the Bessel function value for a numerical expression, based on the indicated order.

Syntax

BESSEL(FunctionType$, NumExp)

Arguments

• FunctionType$ is a string expression that indicates the order of the Bessel function:

1. "I1", Modified Bessel function of the first kind;
2. "J1", Bessel function of the first kind, first order;
3. "Y1", Bessel function of the second kind, first order;
4. "K1", Modified Bessel function of the second kind;

• NumExp is a numerical expression

...

A is the input value, B1, B2, B3, B4 are the four alternative BESSEL functions.

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