类和线性回归

Question

对不起，打扰你，但我需要帮助。

我有一个任务，使用一个类的程序和计算线性回归，但我的链表类只是接收一个值，我不知道为什么。代码编译但不计算线性回归。

这里是我的代码：

#include<iostream> 
#include<cmath> 
#include<fstream> 
#include<iomanip> 
#include<istream> 
#include<string> 


float a,b,r; 
float X[20],Y[20],n = 10, z; 
int intAux = 0, intI; 
//double dblSumX,dblSumY,dblSumX2,dblSumY2,dblSumXY; 
float dblSumX,dblSumY,dblSumX2,dblSumY2,dblSumXY; 
//double dblSXX,dblSYY,dblSXY; 
float dblSXX,dblSYY,dblSXY; 

using namespace std; 

// Clase Nodo 
//p.base= 
class Nodo { 
float fltEstProxySize; 
float fltDevelHours; 
float fltEst; 
Nodo* next; 

public: 
    Nodo() {}; 
    void SetVariables(float data) 
    { 
     fltEstProxySize = data; 
     fltDevelHours = data; 
     fltEst = data; 
    } 

    void SetData(float EPS, float DH, float ES) 
    { 
     fltEstProxySize = EPS; 
     fltDevelHours = DH; 
     fltEst = ES; 
    }; 

    void SetNext(Nodo* aNext) 
    { 
     next = aNext; 
    }; 

    float Data() 
    { 
     return(fltEstProxySize, fltDevelHours, fltEst); 
    }; 

    Nodo* Next() 
    { 
     return next; 
    }; 
    }; 


//p. 
//... Clase de la Lista ... 
class Lista { 
Nodo *head; 

public: 
    Lista() { head = NULL; }; 
    void Print(); 
    void Append(float fltEstProxySize, float fltDevelHours, float fltEst); 
    void Delete(float fltEstProxySize, float fltDevelHours, float fltEst); 
}; 


/** 
* ... Imprime el contenido de la lista 
*/ 
//i. 
void Lista::Print() { 

// ... Apuntador temporal ... 
Nodo *tmp = head; 

// ... No hay Nodos ... 
if (tmp == NULL) { 
    cout << "EMPTY" << endl; 
    return; 
} 

// ... Existe un Nodo in the Lista ... 
if (tmp->Next() == NULL) { 
    cout << tmp->Data(); 
    cout << " --> "; 
    cout << "NULL" << endl; 
} 
else { 
    // ... Recorre la lista y la imprime ... 
    do { 
     cout << tmp->Data(); 
     cout << " --> "; 
     tmp = tmp->Next(); 
    } 
    while (tmp != NULL); 

    cout << "NULL" << endl; 
} 
    } 

    //i. 
    // ... Agrega un nodo a la lista ... 
    void Lista::Append(float fltEstProxySize, float fltDevelHours, float fltEst){ 

// ... Aqui crea a Nodo nuevo ... 
Nodo* newNodo = new Nodo(); 

newNodo->SetData(fltEstProxySize, fltDevelHours, fltEst); 
newNodo->SetNext(NULL); 

// ... Crea un apuntador temporal ... 
Nodo *tmp = head; 

if (tmp != NULL) { 
    // ... El Nodo esta en la Lista ... 
    // ... Recorre la Lista ... 
    while (tmp->Next() != NULL) { 
     tmp = tmp->Next(); 
    } 
    // ... El ultimo Nodo de la lista ... 
    tmp->SetNext(newNodo); 
} 
else { 
    // ... Nuevo Nodo de la lista ... 
    head = newNodo; 
} 
    } 



    /** 
    * ... Borra un Nodo de la Lista ... 
    */ 
    //i. 
    void Lista::Delete(float fltEstProxySize, float fltDevelHours, float fltEst){ 

// ... Crea un Nodo temporal ... 
Nodo *tmp = head; 

// ... No hay Nodos ... 
if (tmp == NULL) 
    return; 

// ... ultimo Nodo de la Lista ... 
if (tmp->Next() == NULL) { 
    delete tmp; 
    head = NULL; 
} 
else { 
    // ... Recorre los nodos ... 
    Nodo *prev; 
    do { 
     //if (tmp->Data() == data) break; 
     if(tmp->Data() == fltEstProxySize && tmp->Data() == fltDevelHours) break; 
     prev = tmp; 
     tmp = tmp->Next(); 
    } while (tmp != NULL); 

    // ... Ajusta los Nodos ... 
    prev->SetNext(tmp->Next()); 

    // ... Borra el Nodo actual ... 
    delete tmp; 
} 
    } 



    //i. 
    class RegresionLineal 
    { 
Nodo *head; 
int i; 
//double dblSumX=0,dblSumY=0,dblSumX2=0,dblSumY2=0,dblSumXY=0; 
//double dblSumX,dblSumY,dblSumX2,dblSumY2,dblSumXY; 
//double dblSXX,dblSYY,dblSXY; 

    public: 
RegresionLineal(){head = NULL;}; 
void Calculo(); 

    }; 

    void RegresionLineal::Calculo() 
    { 
for (intI=0;intI < 20; intI++) 
{ 
    //if (X[intI] != 0) 
    //{ 
     dblSumX += X[intI]; 
     dblSumX2 += (X[intI] * X[intI]); 
    //} 

    //if(Y[intI] !=0) 
    //{ 
     dblSumY += Y[intI]; 
     dblSumY2 += (Y[intI] * Y[intI]); 
     dblSumXY += (X[intI] * Y[intI]); 
    //} 
} 

dblSXX = dblSumX2 - dblSumX * dblSumX/n; 
dblSYY = dblSumY2 - dblSumY * dblSumY/n; 
dblSXY = dblSumXY - dblSumX * dblSumY/n; 

// ... pendiente infinita ... 
if (abs(dblSXX) == 0) 
    //return 0; 
    z=0; 


// ... calcula la pendiente ... 
b = dblSXY/dblSXX; 
a = dblSumY/n - (b) * dblSumX/n; 

// ... calcula el coeficiente de regresion ... 
if (abs(dblSYY) == 0) 
    r = 1; 
else 
    r = dblSXY/sqrt(dblSXX * dblSYY); 


    } 


    // ... ... ... ... ... ... ... ... ... ... ... ... ... 
    int main() 
    { 
    // ... Variables auxiliares ... 
     float fltMedia2 = 0; 
     float fltDevStd1 = 0; 
    float fltDevStd2 = 0; 
    float fltSuma1 = 0; 
    float fltSuma2 = 0; 
    float fltCuenta = 0; 
    int intF = 0; 
    float fltAux1 = 0, fltAux4 = 0, fltMedia1, fltAux3; 
float fltAux2 = 0; 


Lista lista; 
RegresionLineal RL; 

// ... inicializa arreglo ... 
for (intI = 0; intI < 20; intI++) 
{ 
    X[intI] = 0; 
    Y[intI] = 0; 
} 

// ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 

cout << "\nPlease introduce the values of table 1: (Note: to finish just type -1 and hit enter)\n"; 

while(!cin.eof()) 
{ //d. 
    cout << "\nPlease introduce X: "; 
    cin >> fltAux1; 
    cout << "\nPlease introduce Y: "; 
    cin >> fltAux2; 
    cout << "\nPlease introduce the estimate: "; 
    cin >> fltAux3; 
    //d. 
    //d. 

    if ((fltAux1 == -1) || (fltAux2 == -1)) 
    { 
     break; 
    } 
    else 
    { 
     lista.Append(fltAux1, fltAux2, fltAux3); 
     X[intI] = fltAux1; 
     Y[intI] = fltAux2; 
     fltCuenta = fltCuenta + 1; 
     intI++; 
     cout << "fltAux1: " << fltAux1 << endl; 
     cout << "fltAux2: " << fltAux2 << endl; 
    } 
} 

lista.Print(); 
// ... Calcula la regresión lineal ... 
RL.Calculo(); 
cout << "\na: " << a << "\n" << endl; 

cout << "Suma X: " << dblSumX << endl; 
cout << "Suma Y: " << dblSumY << endl; 
cout << "Suma X2: " << dblSumX2 << endl; 
cout << "Suma Y2: " << dblSumY2 << endl; 
cout << "Suma X*Y:" << dblSumXY << endl; 


return 0; 
    } 

Answer 1

虽然还有其他一些问题/代码可能的改进，你所面对现在的问题是，因为你之前没有while回路重置intI为0您的main功能。

以下是代码校正摘录：

// ... inicializa arreglo ... 
for (intI = 0; intI < 20; intI++) 
{ 
    X[intI] = 0; 
    Y[intI] = 0; 
} 

// ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 

cout << "\nPlease introduce the values of table 1: (Note: to finish just type -1 and hit enter)\n"; 

intI = 0;   //Corrected here 

while(!cin.eof())