Compute a Bessel function of the first kind
Synopsis:
#include <math.h>
double j1( double x );
float j1f( float x );
Arguments:
 x
 The number that you want to compute the Bessel function for.
Library:
libbessel
Use the l bessel option to
qcc
to link against this library.
Description:
Compute the Bessel function of the first kind for x.
Returns:
The result of the Bessel function of x.
Note:
If an error occurs, these functions return 0, but this is also a valid
mathematical result.
If you want to check for errors, set
errno
to 0, call the function, and then check
errno again.
These functions don't change
errno if no errors occurred.
Classification:
j1() is
POSIX 1003.1 XSI;
j1f() is
Unix
Safety: 

Cancellation point 
No 
Interrupt handler 
No 
Signal handler 
No 
Thread 
Yes 