Matrix method help please

[davefulton]

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?

#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

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

[Paul McKenzie]

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

Regards,

Paul McKenzie

[davefulton]

Sorry

#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

[Paul McKenzie]

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

[davefulton]

Thank you