Macierz

[ArtifeX]

Aż sie boje napisać tutaj ale naprawde nie mialm kontaktu z macierzami a czytam i nic nie rozumiem. Jesli mozecie pomozcie w rozwiazaniu nastepujcego probalmu:

 

Napisac program do obliczania iloczynu dwoch macierzy A[m][p] i B[p][n],

Funkcja 1: Mnozenie wiersza przez kolumne,

Funkcja 2: Mnozenie wszystkich wierszy przez jedna kolumne,

#include<stdio.h>#include<math.h>#include<string.h>int main(void){unsigned int A[m][p];unsigned int B[p][n];int k,w; //k-kolumna, w-wiersz

NIe postaralem sie wiem, coz prosze Was o pomoc. Naprowadzcie mnie.

[_Borys]

Niech strace :

 

#include <iostream>#include <iomanip> using namespace std;// declarin classclass Matrix{	// public functions	public:  // these functions are in charge of getting matrix dimensions from the user  bool Input_matrix_1st_dimensions ();  bool Input_matrix_2nd_dimensions ();  // this checks if the dimensions allow the matrixes to be multiplied  bool Check_2nd_matrix_dimensions ();  // these functions get matrix dimansions from private values  int Get_number_of_rows_m1 ();  int Get_number_of_columns_m1 ();  int Get_number_of_rows_m2 ();  int Get_number_of_columns_m2 ();  int Get_number_of_rows_m3 ();  int Get_number_of_columns_m3 ();  // these functions let the matrix values to be inputed  bool Input_values_1st_matrix (int &Number_of_rows_m1, int &Number_of_columns_m1);  bool Input_values_2nd_matrix (int &Number_of_rows_m2, int &Number_of_columns_m2);  // these funcyions display first and second matrix  void Display_1st_martrix ( int &Number_of_rows_m1, int &Number_of_columns_m1 );  void Display_2nd_martrix ( int &Number_of_rows_m2, int &Number_of_columns_m2 );  // this function creates third matrix by multiplying first and second matrix  void Multiply_Matrixes (int &Number_of_rows_m3, int &Number_of_columns_m3, int &Number_of_columns_m1);  // this function displays third matrix  void Display_3rd_martrix ( int  &Number_of_columns_m3, int &Number_of_rows_m3  );  // this function sets third matrix dimaensions  void Set_matrix_3_dimensions ();  	// private values for	private:  // Matrix 1:  // number of rows   int Number_of_rows_m1;  // number of columns  int Number_of_columns_m1;  // Matrix 2:  // number of rows   int Number_of_rows_m2;  // number of columnss  int Number_of_columns_m2;  // Matrix 3:  // number of rows   int Number_of_rows_m3;  // number of columns  int Number_of_columns_m3;  // this intializes the maximum matrixes that can be used  int Matrix_1 [10] [10];  int Matrix_2 [10] [10];   int Matrix_3 [10] [10];};int main (){char loop_control = 'y';int return_value = 0;// declaring objectMatrix M;// begining the first loopwhile ( loop_control == 'y'){ // error checking if the input data is wrong the function returns falseif ( M.Input_matrix_1st_dimensions () == true )	{   // error checking if the input data is wrong the function returns false  if ( M.Input_matrix_2nd_dimensions () == true && M.Check_2nd_matrix_dimensions () == true ) 	 {    // declaring local variables used in int main function    int number_of_rows_m1 = 0;    int number_of_columns_m1 = 0;   	 int number_of_rows_m2 = 0;    int number_of_columns_m2 = 0;    int number_of_rows_m3 = 0;    int number_of_columns_m3 = 0;        // setting the variables by calling functions that get data from class Matrix private values    number_of_rows_m1 = M.Get_number_of_rows_m1 ();    number_of_columns_m1 = M.Get_number_of_columns_m1 ();    number_of_rows_m2 = M.Get_number_of_rows_m2 ();    number_of_columns_m2 = M.Get_number_of_columns_m2 ();    M.Set_matrix_3_dimensions ();    number_of_rows_m3 = M.Get_number_of_rows_m3 ();    number_of_columns_m3 = M.Get_number_of_columns_m3 ();    // error checking if the input data is wrong the function returns false    if ( M.Input_values_1st_matrix ( number_of_rows_m1, number_of_columns_m1) == true )   	 {       // error checking if the input data is wrong the function returns false      if ( M.Input_values_2nd_matrix (number_of_rows_m2, number_of_columns_m2) == true )     	 {           // calling functions displaing matrixes 1 and 2           M.Display_1st_martrix ( number_of_rows_m1, number_of_columns_m1 );           M.Display_2nd_martrix ( number_of_rows_m2 ,number_of_columns_m2 );           // calling functions multiplying matrixes 1 and 2           M.Multiply_Matrixes (number_of_rows_m3, number_of_columns_m3, number_of_columns_m1);           // calling functions displaing matrix 3           M.Display_3rd_martrix (number_of_rows_m3, number_of_columns_m3);           cout << endl;           // this asks user if he wants to continue           cout << " Do you want to continue ? Press y if so or no if not " << endl;           cin >> loop_control;           if ( cin.fail() != 0 )            {        	 loop_control = 'n';        	 return_value = 1;        	 cerr << " ERROR! Could not read the continue input ! " << endl;         }     	 }      else	     	 {        loop_control = 'n';         return_value = 1;     	 }   	 }        	     else	   	 {      loop_control = 'n';      return_value = 1;   	 }  	 }    else	 	 {    loop_control = 'n';    return_value = 1; 	 } 	}else		{  loop_control = 'n';  return_value = 1;	}}cout << "Bye!Bye! " << endl;return return_value;}  // this gets data from user if data correct returns true if not falsebool Matrix::Input_matrix_1st_dimensions (){	bool rv = true;	int number_of_rows = 0;	int number_of_columns = 0; 	cout << endl;	cout << " Enter the number of rows for the first matrix" << endl;	cin >> number_of_rows;	if (cin.fail () == 0 and number_of_rows >= 1 and number_of_rows <= 10)  {  	 cout << endl; 	 cout << " Enter the number of columns for the first matrix " << endl; 	 cin >> number_of_columns;  	 if ( cin.fail() ==0 and number_of_columns >= 1 and number_of_columns <= 10)    {   	 Number_of_rows_m1 = number_of_rows;   	 Number_of_columns_m1 = number_of_columns;   	 } 	 else     {   	 cerr << " Error!! Could not read the number of columns input " << endl;   	 cerr << " Remember the number of columns must be an inteager grater or equal 1 and less than 10" << endl;   	 rv = false;    }  }	else   { 	 cerr << " Error!! Could not read the number of rows input " << endl; 	 cerr << " Remember the number of columns must be an inteager grater or equal 1 and less rhan 10 " << endl; 	 rv = false;  }return rv;cout << endl;}// this gets data from user if data correct returns true if not falsebool Matrix::Input_matrix_2nd_dimensions (){	bool rv = true;	int number_of_rows = 0;	int number_of_columns = 0; 	cout << endl;	cout << " Enter the number of rows for the second matrix" << endl;	cin >> number_of_rows;	if (cin.fail () == 0 and number_of_rows >= 1 and number_of_rows <= 10)  {  	 cout << endl; 	 cout << " Enter the number of columns for the second matrix " << endl; 	 cin >> number_of_columns;  	 if ( cin.fail() ==0 and number_of_columns >= 1 and number_of_columns <= 10)    {   	 Number_of_rows_m2 = number_of_rows;   	 Number_of_columns_m2 = number_of_columns;    } 	 else     {   	 cerr << " Error!! Could not read the number of columns input " << endl;   	 cerr << " Remember the number of columns must be an inteager grater or equal 1 and less than 10" << endl;    rv = false;    }  }	else   { 	 cerr << " Error!! Could not read the number of rows input " << endl; 	 cerr << " Remember the number of columns must be an inteager grater or equal 1 and less than 22" << endl; 	 rv = false;  }	return rv;}// this gets data from user if data correct returns true if not falsebool Matrix::Check_2nd_matrix_dimensions (){	bool rv = true; 	if ( Matrix::Number_of_columns_m1 == Matrix::Number_of_rows_m2 )  {  }	else   { 	 cerr << " Wrong number of rows input " << endl; 	 cerr << " To multiply two matrixes the number of columns in first matrix must be equal to " << endl; 	 cerr << " the number of rows in second matrix " << endl; 	 rv = false;  }return rv;}    int Matrix::Get_number_of_rows_m1 (){return Number_of_rows_m1;}int Matrix::Get_number_of_columns_m1 (){return Number_of_columns_m1;}int Matrix::Get_number_of_rows_m2 (){return Number_of_rows_m2;}int Matrix::Get_number_of_columns_m2 (){return Number_of_columns_m2;}int Matrix::Get_number_of_rows_m3 (){return Number_of_rows_m3;}int Matrix::Get_number_of_columns_m3 (){return Number_of_columns_m3;}// this gets data from user if data correct returns true if not falsebool Matrix::Input_values_1st_matrix (int &Number_of_rows_m1, int &Number_of_columns_m1){	bool rv = true;	cout << endl;	cout << endl;	cout << " Enter the values for first Matrix " << endl; 	cout << endl;	int i;	int j;	for ( int i = 0; ( (i < Number_of_rows_m1) && (cin.fail () ==0)); i ++ )  { 	 for (j = 0; ((j < Number_of_columns_m1) && ( cin.fail() == 0)); j ++  )    {   	 cout << " Enter the value for the cell in row " << i+1 << " column " << j+1 << endl;   	 cin >> Matrix_1 [i][j];       }  }	if ( cin.fail () != 0 )  { 	 cout << " ERROR! Wrong input data !" << endl; 	 rv = false;  }  return rv;}// this gets data from user if data correct returns true if not falsebool Matrix::Input_values_2nd_matrix (int &Number_of_rows_m2, int &Number_of_columns_m2){			bool rv = true;	cout << endl;	cout << endl;	cout << " Enter the values for second Matrix " << endl; 	cout << endl;	int i;	int j;	for (i = 0; i < Number_of_rows_m2; i ++ )  { 	 for ( j = 0;(( j < Number_of_columns_m2) && (cin.fail () == 0)); j ++  )    {   	 cout << " Enter the value for the cell in row " << i+1 << " column " << j+1 << endl;   	 cin >> Matrix_2 [i][j];       }  }  if ( cin.fail () != 0 )  { 	 cout << " ERROR! Wrong input data !" << endl; 	 rv = false;  }  cout << endl;return rv;}void Matrix::Display_1st_martrix ( int &Number_of_rows_m1, int &Number_of_columns_m1 ){	cout << " 1st Matrix: " << endl;	cout << endl;  	for (int i = 0; i < Number_of_rows_m1; i ++ )  { 	 cout << " | "; 	 for (int j = 0; j < Number_of_columns_m1; j ++  )    {   	 cout << setw (5) << Matrix_1 [i][j] << " | ";       } 	 cout << endl;  }cout << endl;}void Matrix::Display_2nd_martrix ( int &Number_of_rows_m2, int &Number_of_columns_m2 ){		cout << " 2nd Matrix : " << endl;	cout << endl;	for (int i = 0; i < Number_of_rows_m2; i ++ )  { 	 cout << " | "; 	 for (int j = 0; j < Number_of_columns_m2; j ++  )    {   	 cout << setw (5) <<  Matrix_2 [i][j] << " | ";       } 	 cout << endl;  }  cout << endl;}void Matrix::Set_matrix_3_dimensions (){	Matrix::Number_of_rows_m3 = Matrix::Number_of_rows_m1;	Matrix::Number_of_columns_m3 = Matrix::Number_of_columns_m2;}// this multiply matrixes 1 and 2 void Matrix::Multiply_Matrixes (int &Number_of_rows_m3, int &Number_of_columns_m3, int &Number_of_columns_m1){  for (int i = 0; i < Number_of_rows_m3; i++)  	 {  for (int j = 0; j < Number_of_columns_m2; j++)           {                    int sum = 0;                    for (int k = 0; k < Number_of_columns_m1; k++)                     	 {   	 sum = sum + ( Matrix_1[i][k] * Matrix_2[k][j]);                   	 Matrix_3[i][j] = sum;    } 	 }	}} void Matrix::Display_3rd_martrix ( int  &Number_of_rows_m3, int &Number_of_columns_m3  ){		cout << " 3rd Matrix = 1st Matrix * 2nd Matrix : " << endl;	cout << endl;	for (int i = 0; i < Number_of_rows_m3; i ++ )  { 	 cout << " | "; 	 for (int j = 0; j < Number_of_columns_m3; j ++  )    {   	 cout << setw (5) <<  Matrix_3 [i][j] << " | ";       } 	 cout << endl;  }  cout << endl;}

Przyjrzyj sie uwarznie funkcji void Matrix::Multiply_Matrixes (int &Number_of_rows_m3, int &Number_of_columns_m3, int &Number_of_columns_m1)

powinna ci ona pomodz w zrozumieniu jak to dziala

Pozdrawiam

[ArtifeX]

Dodam jeszcze ze ma byc to w jezyku C. Siedze nad tym programem troche mam, jak skoncze wkleje kod i poprosze od modyfikacje (bo na pewno take beda potrzebne). Z gory dziekuje

[_Borys]

Dodam jeszcze ze ma byc to w jezyku C. Siedze nad tym programem troche mam, jak skoncze wkleje kod i poprosze od modyfikacje (bo na pewno take beda potrzebne). Z gory dziekuje

1270421[/snapback]

To zmien class na struct i bedzie w jezyku C. Mowilem popatrz na ten program zobacz co z czym i wykorzystaj obserwacje w swoim programie. Juz latwiej chyba nie moze byc.

[jack0]

#include<iostream>#include<iomanip>using namespace std;int main(){int m,p,n;cout<<"Wierze macierzy A: "; cin>>m;cout<<"Kolumny macierzy A: "; cin>>p;cout<<"Kolumny macierzy B: "; cin>>n;int A[m][p], B[p][n], C[m][n];//Wczytanie do macierzy Acout<<"Podaj liczby do amcierzy A:";for(int i=0;i<m;i++)    for(int j=0;j<p;j++)        cin>>A[i][j];               //Wyswietlenie macierzy Acout<<"Macierz A:"<<endl;for(int i=0;i<m;i++,cout<<endl)    for(int j=0;j<p;j++)        cout<<setw(4)<<A[i][j];//--------------//Wczytanie do macierzy Bcout<<"Podaj liczby do amcierzy B:";for(int i=0;i<p;i++)    for(int j=0;j<n;j++)        cin>>B[i][j];        //Wyswietlenie macierzy Bcout<<"Macierz B:"<<endl;for(int i=0;i<p;i++,cout<<endl)    for(int j=0;j<n;j++)        cout<<setw(4)<<B[i][j];               //--------------//Zerowanie macierzy Cfor(int i=0;i<m;i++)    for(int j=0;j<n;j++)        C[i][j]=0; //--------------                           //Mnozenie macierzyfor(int i=0;i<m;i++)//wiersze macierzy A    for(int j=0;j<n;j++)//kolumny macierzy B        for(int k=0;k<p;k++)//kolumny macierzy A=wiersze macierzy B            C[i][j]=C[i][j]+A[i][k]*B[k][j];            //--------------           //Wyswietlenie macierzy Cfor(int i=0;i<m;i++,cout<<endl)    for(int j=0;j<n;j++)        cout<<setw(4)<<C[i][j];             system("pause");return 0;}

Moja własna wersja tego programu :) przed sekundka napisana. Sam algorytm, brak zabezpieczen typu: if(m!=n) .....

wszelkie pytania na GG 4777941 bo na forum nie siedze, zajrzalem przez przypadek po 2 latach sprawdzic czy mi konta nie skasowali ;)