BESSEL returns the Bessel function value for a numerical expression, based on the indicated order.
BESSEL(FunctionType$, NumExp)
Arguments
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Modified Bessel function of the first kind;
BESSEL("I1", 0.3) returns 0.15169383946249
...
Bessel function, first kind, first order:
BESSEL("J1", 0.3) returns 0.14831881628779
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Bessel function, second kind, first order:
BESSEL("Y1", 0.3) returns -2.29310513710031
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Bessel function, second kind, first order:
BESSEL("K1", 0.3) returns 3.05599204051877
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A is the input value, B1, B2, B3, B4 are the four alternative BESSEL functions.
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