Matrix method help please

I have written some simple methods for a matrix class to do two dimensional problem solving but I'm not sure how to do a replace one matrix's values with another.
Could anybody help please?

Code:

---

#include "Matrix.h"
#include <iostream>
#include <fstream>

using namespace std;

//constructor
Matrix::Matrix(int N) {
        nelts = N*N;
        data.resize(nelts);
}

//destructor
Matrix::~Matrix(){}



//METHOD Set value of element i, j
void Matrix::setValue(int i, int j, int N, double x) {
        if (i<0 || i >= nelts){
          cerr << "Out of bounds.\n";        //error check
          abort();
          }
        else
          data[j*N+i] = x;
}

//METHOD clear the Matrix (set to size zero)
void Matrix::clearMat(){
        data.clear();
}

//METHOD Get value of element i, j
double Matrix::getValue(int i, int j, int N) {
       
  return data[i + j*N];
}

//METHOD print Matrix, takes starting point as arg

void Matrix::print(int N){       
  for (int i=0; i < N; i++) {
        for (int j=0; j < N; j++) {
        cout << data[j*N+i] << ",";
        }
  cout << endl;
  }
}

void Matrix::output(int N){       
  ofstream stuff;
  stuff.open ("stuff.csv", ios::app);
  for (int i=0; i < N; i++) {
        for (int j=0; j < N; j++) {
        stuff << data[j*N+i] << ",";
        }
  stuff << endl;
  }
  stuff.close();
}

//METHOD returns size of Matrix
int Matrix::getsize(){
        int size=data.size();
        return size;
}

void Matrix::viewall(){
  for (int i = 0; i <= nelts-1; i++){
        cout << data[i] << endl;
  }
}

---

I've been trying something like

Code:

---


//METHOD returns size of Matrix
void Matrix::replace(Matrix &v){
        data=v.data;
}

---

Please post Matrix.h. No one knows what variable type "data" is.

Regards,

Paul McKenzie

Sorry

Code:

---

#ifndef MATRIX_H                //preprocessor instructions
#define MATRIX_H

#include <iostream>                //preprocessor instructions
#include <vector>
#include <math.h>
#include <iomanip>
#include <fstream>

using namespace std;

class Matrix{

public:                                //accessible anywhere in the program
        Matrix(int N);
        ~Matrix();

        void swapper(Matrix &v);
        void viewall();
        void setValue(int i, int j, int N, double x);
        void clearMat();
        double getValue(int i, int j, int N);
        void print(int N);
        void output(int N);
        int getsize();

private:                //only accessible insde the scope of the class
        int nelts;
        int N;
        vector <double> data;
       
};
#endif

---

OK.

The line you say shouldn't work does work. It copies the contents of the passed in vector to the one in the object. So I see no problem -- it works exactly as you've coded it to work.

Regards,

Paul McKenzie

Thank you