Compute a Bessel function of the first kind
#include <math.h> double j1( double x ); float j1f( float x );
These functions compute the Bessel function of the first kind for x.
To check for error situations, use feclearexcept() and fetestexcept():
The result of the Bessel function of x.
If x argument is too large in magnitude, or the correct result would cause an underflow, 0 is returned, and a range error may occur. If x is NaN, NaN is returned.
j1() is POSIX 1003.1 XSI; j1f() is Unix
Safety: | |
---|---|
Cancellation point | No |
Interrupt handler | No |
Signal handler | No |
Thread | Yes |