J0(3) BSD Programmer's Manual J0(3)

j0,j0f,j1,j1f,jn,jnf,y0,y0f,y1,y1f,yn,ynf- Bessel functions of first and second kind

libm

#include <math.h>doublej0(double x);floatj0f(float x);doublej1(double x);floatj1f(float x);doublejn(int n,double x);floatjnf(int n,float x);doubley0(double x);floaty0f(float x);doubley1(double x);floaty1f(float x);doubleyn(int n,double x);floatynf(int n,float x);

The functionsj0(),j0f(),j1() andj1f() compute theBessel function ofthe first kind of the order0 and theorder1, respectively, for the real valuex; the functionsjn() andjnf() compute theBessel function of thefirst kind of the integer nfor the real valuex. The functionsy0(),y0f(),y1() andy1f() compute the linearly indepen- dentBessel function of the second kind of the order0 and theorder1, respectively, for the positiveintegervaluex(expressed as a double); the functionsyn() andynf() compute theBessel function of the secondkind for the integer nfor the positiveintegervaluex(expressed as a double).

If these functions are successful, the computed value is returned, other- wise the global variableerrnois set to EDOM and a reserve operand fault is generated.

math(3)

This set of functions appeared in Version 7 AT&T UNIX. MirOS BSD #10-current April 19, 1991 1

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