J0(3) BSD Library Functions Manual J0(3)[top]NAMEj0, j0f, j1, j1f, jn, jnf, y0, y0f, y1, y1f, yn, ynf — Bessel functions of first and second kindLIBRARYMath Library (libm, -lm)SYNOPSIS#include <math.h> double j0(double x); float j0f(float x); double j1(double x); float j1f(float x); double jn(int n, double x); float jnf(int n, float x); double y0(double x); float y0f(float x); double y1(double x); float y1f(float x); double yn(int n, double x); float ynf(int n, float x);DESCRIPTIONThe functions j0(), j0f(), j1() and j1f() compute the Bessel function of the first kind of the order 0 and the order 1, respectively, for the real value x; the functions jn() and jnf() compute the Bessel function of the first kind of the integer order n for the real value x. The functions y0(), y0f(), y1() and y1f() compute the linearly indepen‐ dent Bessel function of the second kind of the order 0 and the order 1, respectively, for the positive integer value x (expressed as a double); the functions yn() and ynf() compute the Bessel function of the second kind for the integer order n for the positive integer value x (expressed as a double).RETURN VALUESIf these functions are successful, the computed value is returned, other‐ wise the global variable errno is set to EDOM and a reserve operand fault is generated.SEE ALSOmath(3)HISTORYThis set of functions appeared in Version 7 AT&T UNIX.BSDApril 19, 1991 BSD

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