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Manual Reference Pages  - besy (3)

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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

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besy (3)

March 11, 2021

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