C Library Functions  - besy (3)

NAME
besy(3f) - [M_bessel] compute the Y Bessel function for a given argument and order

CONTENTS

Synopsis
Description
Options
Subroutines And Function Subprograms Required
Example

SYNOPSIS
subroutine besy(x,n,by,ier)

DESCRIPTION

    METHOD
Recurrence relation and polynomial approximation technique as described by A.J.M.Hitchcock,"Polynomial Approximations to Bessel Functions of Order Zero and One and to Related Functions", M.T.A.C., V.11,1957,PP.86-88, and G.N. Watson, "A Treatise on the Theory of Bessel Functions", Cambridge University Press, 1958, P. 62

OPTIONS
Description of Parameters 

     X    the argument of the Y Bessel function desired
     N    the order of the Y Bessel function desired
     BY   the resultant Y Bessel function
     IER  resultant error code where


           IER=0  no error
           IER=1  N is negative
           IER=2  X is negative or zero
           IER=3  BY has exceeded magnitude of 10**70

    REMARKS
Very small values of X may cause the range of the library function LOG() to be exceeded 

        X must be greater than zero
        N must be greater than or equal to zero

SUBROUTINES AND FUNCTION SUBPROGRAMS REQUIRED
none

EXAMPLE

Nemo Release 3.1 besy (3) February 23, 2025
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