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| jn |
| Portability: | UNIX compatible |
| SYNOPSIS | |
| DESCRIPTION | |
| RETURN VALUE | |
| DIAGNOSTICS | |
| EXAMPLE | |
| RELATED FUNCTIONS | |
| SEE ALSO |
| SYNOPSIS |
#include <lcmath.h> double jn(int n, double x);
| DESCRIPTION |
jn
computes the Bessel function of the first kind with order
n
of the value
x
. The CPU time required
to compute the Bessel function increases with increasing values for
n
. For very large values of
n
, the time can be quite large.
| RETURN VALUE |
jn
returns the Bessel function of the first kind with order
n
of the argument
x
, provided that
this value is computable.
| DIAGNOSTICS |
If the magnitude of
x
is too large (|x| > = 6.7465e9),
jn
returns 0.0. In this case, a message indicating "total loss of
significance"
is also written to
stderr
(the standard
error file).
If an error occurs in
jn
, 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 7 at x = 5 using
jn
:
#include <stdio.h>
#include <lcmath.h>
main()
{
double y;
y = jn(7, 5.);
printf("jn(7, 5.) = %lf\n", y);
}
| RELATED FUNCTIONS |
j0
,
j1
,
_matherr
,
y0
,
y1
,
yn
| SEE ALSO |
|
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Copyright © 2001 by SAS Institute Inc., Cary, NC, USA. All rights reserved.