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Repeat element in matrix 2D

mrsh (27)
I failed to print out matrix MX,what wrong with my code?

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 #include <stdio.h>
#include <iostream>
#include <cmath>
#include <conio.h>//define getch
#include <iomanip>
#include <fstream>
#include <string>
#include <map>
#include <random>
#include <chrono>
#include <cstdlib>
#include<algorithm>

#define m 10

using namespace std;
void main()
{
	int i, j,max,M,KMAX,L=0,A=0,k=1;
	int a[m];
	//double MX;
	double p = 0.95;
	double a1 = 20.79, a2 = 0.005;
	int Vmax = 3, KM = 5;
	cout.setf(ios::fixed);
	cout.precision(3);

	//////////////////////////////////////////////////////////////////////////////////////////
	//value of X-axis
	/////////////////////////////////////////////////////////////////////////////////////////

	double X_axis[m];
	for (i = 1; i <= m; i++)
	{
		X_axis[i] = ((i - 1) / 4.0);
		cout << "   " << X_axis[i] << endl;
	}

	///////////////////////////////////////////////////////////////////////////////////////
	//random number follow poisson distribution
	//////////////////////////////////////////////////////////////////////////////////////
	cout << "some Poisson-distributed results:" << endl;

	unsigned seed = std::chrono::system_clock::now().time_since_epoch().count(); 
	std::default_random_engine generator(seed);
	std::poisson_distribution<int> distribution(2 * X_axis[m]);

	for (int i = 0; i < m; ++i)
	{
		a[i] = distribution(generator);
		std::cout << i << "   " << a[i] << "  " << endl;
	}
	
	////////////////////////////////////////////////////////////////////////////////////
	//maximum number of DSB
	///////////////////////////////////////////////////////////////////////////////////
	max = a[1];
	for (int i = 0; i < m; ++i)
	{
		if (max <= a[i])
			max = a[i];
		KMAX = max;
	}
	cout << "maximum number is " << KMAX << endl;
	
    /////////////////////////////////////////////////////////////////////////////////////////
	//matrix
	////////////////////////////////////////////////////////////////////////////////////////
    
	unsigned short int size = KMAX;
	std::vector<int> vec(size);

	std::cout << "Size of vector is: " << vec.size() << '\n';
	vector<int> P;
	for (int i = 0; i < vec.size(); i++)
	{
	    double	P = (p*Vmax*i) / (KM + i);
		double  Q = (1 - p)*Vmax*i / (KM + i);
		cout << "P[" << i << "] = " << P << "\t" << "Q[" << i << "] = " << Q << endl;
	}
	
	int M = ((vec.size() + 1)*(vec.size() + 2)) / 2;

	vector<vector<int>> MX;
	

	for (i = vec.size(); i >= 1; i--) ;// Position P in MX matrix
	{
		for (j = 1; j <= i; j++)
		{
			
			MX[j - 1 + L][vec.size() + k] = P[A + 1];
			cout << "MX[" << j - 1 + L << "][" << vec.size() + k << "] = " << MX[i][j] << endl;
			k++;
		}
		cout<<endl;
		L = k + A;
		A++;

	}



	_getch();
}
Tenma (7)
I failed to print out matrix MX,what wrong with my code?

Can you tell us what is a matrix MX?
Last edited on
lastchance (6980)
I wonder if you could fix a few things first and then re-post (as a new post) - this code is very difficult to get to compile.

- please use int main(), not void main();

- variable M is declared twice:
int i, j,max,M,KMAX,L=0,A=0,k=1;

int M = ((vec.size() + 1)*(vec.size() + 2)) / 2;

- ARRAYS COUNT FROM 0, NOT 1 - there are huge inconsistencies in your code here.
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	double X_axis[m];
	for (i = 1; i <= m; i++)    // <=== bound to go beyond the end of the array
	{
		X_axis[i] = ((i - 1) / 4.0);
		cout << "   " << X_axis[i] << endl;
	}


std::poisson_distribution<int> distribution(2 * X_axis[m]); // <=== X_axis[m] doesn't exist

max = a[1]; // <==== probably meant a[0] 

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for (i = vec.size(); i >= 1; i--) ;//  <==== this is going to exceed array bounds
	{
		for (j = 1; j <= i; j++)



- what exactly are you declaring P as? A vector of ints or a double?
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vector<int> P;
	for (int i = 0; i < vec.size(); i++)
	{
	    double	P = (p*Vmax*i) / (KM + i);
		double  Q = (1 - p)*Vmax*i / (KM + i);
		cout << "P[" << i << "] = " << P << "\t" << "Q[" << i << "] = " << Q << endl;
	}



- your for loop ends ... at the semicolon at the end of the line
for (i = vec.size(); i >= 1; i--) ;


- when you first declare vectors they don't have any content (unless you specified it in their constructor) - yet you are using them as if they are fully built. Applies to P and MX.


Please fix all these problems first.
Last edited on
mrsh (27)
Matrix MX is 2D matrix where the size depend on M, and M depend on vec.size() which is KMAX .Element P and Q will be call into matrix MX but in certain position,let say vec.size() is 2, so the matrix MX[6][6],then my final output would be like this where the rest element is 0, 


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 MX[0][0]=0   MX[0][1]=0  MX[0][2]=0   MX[0][3]=P[1]   MX[0][4]=0           MX[0][5]=0
 MX[1][0]=0   MX[1][1]=0  MX[1][2]=0   MX[1][3]=Q[1]   MX[1][4]=P[1]      MX[1][5]=0                                
 MX[2][0]=0   MX[2][1]=0  MX[2][2]=0   MX[2][3]=0        MX[2][4]=Q[1]     MX[2][5]=0
 MX[3][0]=0   MX[3][1]=0  MX[3][2]=0   MX[3][3]=0        MX[3][4]=0          MX[3][5]=P[2]
 MX[4][0]=0   MX[4][1]=0  MX[4][2]=0   MX[4][3]=0        MX[4][4]=0          MX[4][5]=Q[2]
 MX[5][0]=0   MX[5][1]=0  MX[5][2]=0   MX[5][3]=0        MX[5][4]=0          MX[5][5]=0


previously my KMAX is int constant, then i changed the programme where KMAX is maximum number from random number, so I can't create arrays from random numbers generated at run time, because my KMAX depend on random number, then i did this 

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unsigned short int size = KMAX;
std::vector<int> vec(size);


only then i can print out P and Q,and this is the first time i'm using std::vector.Below is the code i put P and Q in matrix MX, for KMAX int contant.

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for (i = vec.size(); i >= 1; i--) ;// Position P in MX matrix
	{
		for (j = 1; j <= i; j++)
		{
			
			MX[j - 1 + L][vec.size() + k] = P[A + 1];
			cout << "MX[" << j - 1 + L << "][" << vec.size() + k << "] = " << MX[i][j] << endl;
			k++;
		}
		cout<<endl;
		L = k + A;
		A++;

	}

the output should be like this

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MX[0][3]=P[1]   
MX[1][4]=P[1]
MX[1][3]=Q[1]
        
MX[3][5]=P[2]
MX[4][5]=Q[2]


I changed KMAX to vec.size() in the for loop since it works for P and Q.what should i do for matrix MX?
lastchance (6980)
Can you post your WHOLE code, please.

You still haven't removed the stray semicolon below (just before //)
for (i = vec.size(); i >= 1; i--) ;// Position P in MX matrix
mrsh (27)
Sorry for pending, this is my whole matrix

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#include <stdio.h>
#include <unsupported/Eigen/MatrixFunctions>
#include <iostream>
#include <math.h>
#include <conio.h>//define getch
#include <iomanip>
#include <fstreaM>
#include <string>
#include <map>
#include <random>
#include <chrono>
#include <vector>

//#define KMAX 2
//#define M ((KMAX+1)*(KMAX+2))/2
#define m 10



using namespace std;
using namespace Eigen;

void main()

{
	int k = 1, L = 0, A = 0, i, j, e,max,M;
	int z = 1, R = 0, C = 0; //variable for Q
	int B = 0, T = 0, c = 1, q = 1, n = 0, H = 0,o = 0,u = 0,t=24,F; // variable for diagonal
	
	//double P[KMAX];
	//double Q[KMAX];
	//double S[KMAX];
	
	//double E[M][M];
 	
	//double Matrix[M + 1][M + 1];
	//double I[M + 1][M + 1];
	int a[m];
	//double MX[M][M];
	double p = 0.95;
	double a1 = 20.79, a2 = 0.005;
	int Vmax = 3, KM = 5;
	cout.setf(ios::fixed);
	cout.precision(3);

	//////////////////////////////////////////////////////////////////////////////////////////
	//value of X-axis
	/////////////////////////////////////////////////////////////////////////////////////////

	double X_axis[m];
	for (i = 1; i <= m; i++)
	{
		X_axis[i] = ((i - 1) / 4.0);
		cout << "   " << X_axis[i] << endl;
	}

	///////////////////////////////////////////////////////////////////////////////////////
	//random number follow poisson distribution
	//////////////////////////////////////////////////////////////////////////////////////
	cout << "some Poisson-distributed results:" << endl;

	unsigned seed = std::chrono::system_clock::now().time_since_epoch().count();
	std::default_random_engine generator(seed);
    std::poisson_distribution<int> distribution(2*X_axis[m]);

	int KMAX;

	for (int i = 0; i < m; ++i)
	{
		a[i] = distribution(generator);
		std::cout << a[i] << "  " << endl;
	}
	
    ////////////////////////////////////////////////////////////////////////////////////
    //maximum number of DSB
    ///////////////////////////////////////////////////////////////////////////////////
	
	max=a[1];
	for (int i = 0; i < m; ++i)
	{
		if (max <= a[i])
			max = a[i];
		KMAX = max;
		
	}
	cout << "maximum number is " << KMAX << endl;

	
	unsigned short int size = KMAX;
	std::vector<int> vec(size);

	std::cout << "Size of vector is: " << vec.size() << '\n';

	for (int i = 0; i < vec.size(); i++)
	{
		double	P = (p*Vmax*i) / (KM + i);
		double  Q = (1 - p)*Vmax*i / (KM + i);
		cout << "P[" << i << "] = " << P << "\t" << "Q[" << i << "] = " << Q << endl;
	}

/////////////////////////////////////////////////////////////////////////////////////////
//matrix
////////////////////////////////////////////////////////////////////////////////////////
	
	int M=((KMAX + 1)*(KMAX + 2)) / 2;

	for (i = 0; i <= M; i++)//matrix 0
		for (j = 0; j <= M; j++);
	 MX[M][M]=0;
	
	
	
	

	for (i = KMAX; i >= 1; i--)// position P in matrix
	{
		for (j = 1; j <= i; j++)
		{
			MX[j - 1 + L][KMAX + k] = P[A + 1];
			//cout <<"MX["<<j-1+L<<"]["<<KMAX+k<<"] = "  <<MX[j-1+L][KMAX+k]<<endl;
			k++;
		}
		//cout<<endl;
		L = k + A;
		A++;

	}


	for (i = KMAX; i >= 1; i--)// position Q in matrix
	{
		for (j = 1; j <= i; j++)
		{
			MX[j + R][KMAX + z] = Q[C + 1];
			//cout <<"MX["<<j+R<<"]["<<KMAX+z<<"] = "  <<MX[j+R][KMAX+z]<<endl;
			z++;
		}
		//cout<<endl;
		R = z + C;
		C++;

	}

   for (i = KMAX + 1; i >= 1; i--)// calculation for diagonal

	{
		for (j = 1; j <= i; j++)
		{
			MX[B + c - q][B + c - q] = -(a1*double(j - 1) + a2*double(B)*double(B)) - ((Vmax*double(B)) / (KM + double(B)));
			//cout <<"MX["<<B+c-q<<"]["<<B+c-q<<"] = "<<  MX[B+c-q][B+c-q] << endl;
			c++;

		}
		q++;
		B++;
	}


	cout << "Here is the matrix:" << endl; //double array matrix
	for (i = 0; i < M; i++)
	{
		for (j = 0; j < M; j++)
		{
			//	cout << setw(7) << MX[i][j] << "  ";
		}
		//cout << endl;
	}

////////////////////////////////////////////////////////////////////////////////
	//solve matrix exponential
///////////////////////////////////////////////////////////////////////////////

	MatrixXd result(M, M);  //apply eigen matrix
	for (int i = 0; i < M; i++)
		for (int j = 0; j < M; j++)
			result(i,j)=MX[i][j]*t;
	cout << "     " << result << endl;

	EigenSolver<MatrixXd> es(result);
	MatrixXd D = es.pseudoEigenvalueMatrix();
	MatrixXd V = es.pseudoEigenvectors();
	cout << "The pseudo-eigenvalue matrix D is:" << endl << D << endl;
	cout << "The pseudo-eigenvector matrix V is:" << endl << V << endl;
	cout << "Finally, V * D * V^(-1) = " << endl << V * D * V.inverse() << endl;*/
	
		_getch();
}
lastchance (6980)
There isn't much chance of me compiling this, because I haven't got access to most of your called eigenfunction routines. However, I could take that part out and look at the rest.

Your matrix initialisation is so obscure that I can't work out what you are intending. However, I can see lots of potential issues. In lines 119 and 134 you are trying to use arrays P[] and Q[], but no such arrays exist. Sure, you create some SCALARS P and Q in lines 96-97, but these are not arrays of numbers.

I mentioned far back that lines 51 to 55 are going to write beyond the end of an array.

I'm pretty sure that lines 107-109 aren't going to initialise MX as you presumably intended.

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