BESSEL(3m,L)                AIX Technical Reference                BESSEL(3m,L)



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bessel: j0, j1, jn, y0, y1, yn



PURPOSE

Computes Bessel functions.

LIBRARY

Math Library (libm.a)

SYNTAX

#include <math.h>



                double j0 (x)               double y0 (x)
                double x;                   double x;

                double j1 (x)               double y1 (x)
                double x;                   double x;

                double jn (n, x)            double yn (n, x)
                int n;                      int n; double x;
                double x;



DESCRIPTION

The j0 and j1 subroutines return Bessel functions of x of the first kind, of
orders 0 and 1, respectively.  jn returns the Bessel function of x of the first
kind of order n.

The y0 and y1 subroutines return the Bessel functions of x of the second kind,
of orders 0 and 1, respectively.  yn returns the Bessel function of x of the
second kind of order n.  The value of x must be positive.

Non-positive parameters cause y0, y1, and yn to return the value HUGE, to set
errno to EDOM, and to write a message to the standard error output indicating a
DOMAIN error.

Parameters that are too large in magnitude cause j0, j1, y0, and y1 to return
as much of the result as possible, to set errno to ERANGE, and to write a
message to the standard error output indicating a TLOSS error.

You can change these error-handling procedures with the matherr subroutine.





Processed November 7, 1990       BESSEL(3m,L)                                 1






BESSEL(3m,L)                AIX Technical Reference                BESSEL(3m,L)



ERROR CONDITIONS

The j0, j1, jn, y0, y1, and yn subroutines fail if one or more of the following
is true:

EDOM      The value of x is NaN.

ERANGE    The value of x was too large in magnitude.

RELATED INFORMATION

In this book:  "matherr."











































Processed November 7, 1990       BESSEL(3m,L)                                 2