bessel.h

用matlab语言编写的试井分析的程序

// The following ifdef block is the standard way of creating macros which make exporting 
// from a DLL simpler. All files within this DLL are compiled with the BESSEL_EXPORTS
// symbol defined on the command line. this symbol should not be defined on any project
// that uses this DLL. This way any other project whose source files include this file see 
// BESSEL_API functions as being imported from a DLL, wheras this DLL sees symbols
// defined with this macro as being exported.
#ifdef BESSEL_EXPORTS
#define BESSEL_API __declspec(dllexport)
#else
#define BESSEL_API __declspec(dllimport)
#endif

//声明外部接口
BESSEL_API double besselj0(double x);          //Bessel function of the first kind, order zero
BESSEL_API double besselj1(double x);          //Bessel function of the first kind, order one 
BESSEL_API double besseljn(int n, double x);   //Bessel function of the first kind, order n 

BESSEL_API double bessely0(double x);          //Bessel function of the second kind, order zero 
BESSEL_API double bessely1(double x);          //Bessel function of second kind, order one
BESSEL_API double besselyn(int n, double x);   //Bessel function of second kind, order n

BESSEL_API double besseli0(double x);          //Modified Bessel function of the first kind, order zero
BESSEL_API double besseli1(double x);          //Modified Bessel function of the first kind, order one

BESSEL_API double besselk0(double x);          //Modified Bessel function of the second kind, order zero
BESSEL_API double besselk1(double x);          //Modified Bessel function of the second kind, order one
BESSEL_API double besselkn(int nn, double x);  //Modified Bessel function of the second kind, order n

BESSEL_API double besseljv(double v, double x);/*
                                                 Bessel function of noninteger order (the first kind)
                                                 Returns Bessel function of order v of the argument,
                                                 where v is real.  Negative x is allowed if v is an integer.
                                               */
BESSEL_API double besseliv(double v, double x);/*
                                                 Modified Bessel function of noninteger order (the first kind)
                                                 Returns modified Bessel function of order v of the
                                                 argument.  If x is negative, v must be integer valued.
                                               */