Library: Bessel functions (OMBESSEL) Import: ombessel.xmd

Return type: opaque Returns: A Bessel function of the second kind: order 1. Returns NaN for values of x that are <= 0.

Declaration

export external float function
     y1 value float x

Use y1 to calculate the Bessel function of the second kind (order 1) for any value of x.

Example:

  import "ombessel.xmd" unprefixed
  import "omfloat.xmd" unprefixed
  process
     local float x initial {17.5}
     local float y1-bessel
     set y1-bessel to y1 (x)
     output "A y1 Bessel function of "
         || "d" % x
         || " = "
         || "d" % y1-bessel
         || "%n"
  ; Output: "A y1 Bessel function of 17.5 = 0.098572798734216"

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