NAME

j0(), j1(), jn() − Bessel functions of the first kind

SYNOPSIS

#include <math.h>

double j0(double x);

double j1(double x);

double jn(int n, double x);

DESCRIPTION

j0() and j1() 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.

To use these functions, link in the math library by specifying −lm on the compiler or linker command line. 

RETURN VALUE

If x is NaN, j0(), j1(), and jn() return NaN. 

If the correct result after rounding would be smaller in magnitude than MINDOUBLE, j0(), j1(), and jn() return zero. 

ERRORS

No errors are defined. 

SEE ALSO

y0(3M), isnan(3M), values(5). 

M. Abramowitz and I. Stegun, Handbook of Mathematical Functions (New York: Dover Publications, 1972). 

STANDARDS CONFORMANCE

j0(): SVID3, XPG4.2

j1(): SVID3, XPG4.2

jn(): SVID3, XPG4.2

Hewlett-Packard Company  —  HP-UX Release 10.20:  July 1996