j1

Bessel Function of the First Kind, Order 1

Portability: UNIX compatible

SYNOPSIS
DESCRIPTION
RETURN VALUE
DIAGNOSTICS
EXAMPLE
RELATED FUNCTIONS
SEE ALSO

SYNOPSIS

#include <lcmath.h>

double j1(double x);

DESCRIPTION

j1 computes the Bessel function of the first kind with order 1 of the value x .

RETURN VALUE

j1 returns the Bessel function of the first kind with order 1 of the argument x , provided that this value is computable.

DIAGNOSTICS

If the magnitude of x is too large (|x| > = 6.7465e9), j1 returns 0.0. In this case, the message "total loss of significance" is also written to stderr (the standard error file).

If an error occurs in j1 , the _matherr routine is called. You supply your own version of _matherr to suppress the diagnostic message or modify the value returned.

EXAMPLE

This example computes the Bessel function of the first kind, of order 1 at x = 5 using j1 :

#include <stdio.h>
#include <lcmath.h>

main()
{
   double y;
   y = j1(5.);
   printf("j1(5.) = %lf\n", y);
}

RELATED FUNCTIONS

j0 , jn , _matherr , y0 , y1 , yn

SEE ALSO

Mathematical Functions

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