advmath.cpp

一个在linux下的shell的计算器

/*
 *
 *
 *
 */

#include <iostream>
#include <cmath>
#include "advmath.h"
#include "interpreter.h"

using namespace std;


//
//
//
double sinc(double x)
{
 return ((x == 0) ? 1.0 : sin(x)/x);
}

//
//
//
void LoadAdvMath(ItemList & list)
{
 list.Add(new Operation(ERF, "erf", 1));
 list.Add(new Operation(ERFC, "erfc", 1));
 list.Add(new Operation(GAMMA, "gamma", 1));
 list.Add(new Operation(SIGMOID, "sigmoid", 1));
 list.Add(new Operation(J0, "j0", 1));
 list.Add(new Operation(J1, "j1", 1));
 list.Add(new Operation(Y0, "y0", 1));
 list.Add(new Operation(Y1, "y1", 1));
 list.Add(new Operation(SINC, "sinc", 1));
 list.Add(new Operation(HYPOT, "hypot", 2));
 list.Add(new Operation(JN, "jn", 2));
 list.Add(new Operation(YN, "yn", 2));

 // Alias
 list.Add(new Operation(J0, "bessel0", 1));
 list.Add(new Operation(J1, "bessel1", 1));
 list.Add(new Operation(Y0, "sbessel0", 1));
 list.Add(new Operation(Y1, "sbessel1", 1));
 list.Add(new Operation(JN, "bessel", 2));
 list.Add(new Operation(YN, "sbessel", 2));
}

//
//
//
void AdvancedMathHelp()
{
 cout << endl << "Advanced Mathematical functions: " << endl << endl;
 cout << "  rand     Random number between 0 and 1." << endl;
 cout << "  hypot    Euclidean distance." << endl;
 cout << "  gamma    Gamma function." << endl;
 cout << "  erf      Error function." << endl;
 cout << "  erfc     Complementary erf." << endl;
 cout << "  sigmoid  Logistic (sigmoid) function." << endl;
 cout << "  j0       zero-order Bessel function, 1st kind." << endl;
 cout << "  j1       first-order Bessel function, 1st kind." << endl;
 cout << "  jn       nth-order Bessel function, 1st kind." << endl;
 cout << "  y0       zero-order Bessel function, 2nd kind." << endl;
 cout << "  y1       first-order Bessel function, 2nd kind." << endl;
 cout << "  yn       nth-order Bessel function, 2nd kind." << endl;
 cout << "  sinc     Sinc function." << endl;
}