Using rand() with matrix

[keith katthy]

#include <iostream>
#include <conio.h>
cpp.
 
How to get the random number in matrix like [ ] [ ], the number inside the [ ] [ ], and get the value?
 
 
#include <cstdlib> 
#include <math.h>
#include <stdio.h>
#include <time.h>
using namespace std;
 
 
    int i;
    int x[10];
    int A[10], B[10], C[10], D[10], E[10], F[10]; 
 
    int  main(void)
{
{
    for(i=1;i<7;i++)
 
{
    for(i=1;i<7;i++)
{
    x[i]=i;
    A[i]=(2+pow(x[i],2));
    B[i]=(1+pow(x[i],3));
    C[i]=(2+pow(x[i],2)-1);
    D[i]=(3*pow(x[i],3));
    E[i]=(1+pow(x[i],2));
    F[i]=(3+pow(x[i],2));
}
{
    printf("\n");
 
    for(i=1;i<7; i++)
 
{   
    printf("[%d][%d] A[%d]=%d\n", i,1, i, A[i]); 
}
    printf("\n");
    for(i=1;i<7; i++)
 
{   
    printf("[%d][%d] B[%d]=%d\n", i,2, i, B[i]); 
 
} 
    printf("\n");
    for(i=1;i<7; i++)
 
{   
    printf("[%d][%d] C[%d]=%d\n", i,3, i, C[i]); 
 
}
    printf("\n");
    for(i=1;i<7; i++)
 
{   
    printf("[%d][%d] D[%d]=%d\n", i,4, i, D[i]); 
 
}
    printf("\n");
    for(i=1;i<7; i++)
 
{   
    printf("[%d][%d] E[%d]=%d\n", i,5, i, E[i]); 
    }        
    printf("\n");
    for(i=1;i<7; i++)
 
{   
    printf("[%d][%d] F[%d]=%d\n", i,6, i, F[i]); 
}
}
}
}
    for(i=1;i<7;i++)
{
    cout<<endl;
 
    printf("%d\t", A[i]);
    printf("%d\t", B[i]);   
    printf("%d\t", C[i]);
    printf("%d\t", D[i]);
    printf("%d\t", E[i]);
    printf("%d\t", F[i]);
}
    _getch();
 
    printf("\n");
 
    printf("Random number: %d\n", rand() % 100);
    srand ( 1 );
 
}

[MarkoKlacar]

Hi,

did I understand you correctly if I assume you want to index a matrix with some values and get the value stored?

Cheers

[sicarie]

So you can print rand(), what are you trying to do with that?

If you are attempting to randomly pull values from it, and you have a 2-d array you will need to pull two values from rand both within the limits of your array/matrix. You can call rand(), so I'm assuming saving it isn't the issue, are you having trouble with getting it in the range? If so, you will need to look at the modulus operator ( % ). Otherwise I have no idea what your question is unless it's filling the matrix with random values, in which case you would just implement two for loops to go through each of your index values and save the call to rand() in them.

PS - get rid of getch() and conio.h. They are nonstandard and might break things. Just put a print statement at the bottom of your program, it does the same thing.

[keith katthy]

dear sicarie,

if i delete conio.h, it will be error, and if i change _getch into printf, undeclaire, so what must I do?

[keith katthy]

yes. true , did u now how to do?

[keith katthy]

I have this 2 programming...In the second progrraming I want to call the minimum values from the matrix that I have done, How to the programming?

#include <iostream>
#include <conio.h>
#include <cstdlib> 
#include <math.h>
#include <stdio.h>
#include <time.h>
using namespace std;
 
    void srand ( unsigned int seed );
    int i, j;
    int x[10];
    int A[10], B[10], C[10], D[10], E[10], F[10]; 
 
   int  main(void)
{
{
    for(i=1;i<7;i++)
 
{
    for(i=1;i<7;i++)
{
    x[i]=i;
    A[i]=(2+pow(x[i],2));
    B[i]=(1+pow(x[i],3));
    C[i]=(2+pow(x[i],2)-1);
    D[i]=(3*pow(x[i],3));
    E[i]=(1+pow(x[i],2));
    F[i]=(3+pow(x[i],2));
}
{
    printf("\n");
 
    for(i=1;i<7; i++)
 
{   
    printf("[%d][%d] A[%d]=%d\n", i,1, i, A[i]); 
}
    printf("\n");
    for(i=1;i<7; i++)
 
{   
    printf("[%d][%d] B[%d]=%d\n", i,2, i, B[i]); 
 
} 
    printf("\n");
    for(i=1;i<7; i++)
 
{   
    printf("[%d][%d] C[%d]=%d\n", i,3, i, C[i]); 
 
}
    printf("\n");
    for(i=1;i<7; i++)
 
{   
    printf("[%d][%d] D[%d]=%d\n", i,4, i, D[i]); 
 
}
    printf("\n");
    for(i=1;i<7; i++)
 
{   
    printf("[%d][%d] E[%d]=%d\n", i,5, i, E[i]); 
    }        
    printf("\n");
    for(i=1;i<7; i++)
 
{   
    printf("[%d][%d] F[%d]=%d\n", i,6, i, F[i]); 
}
}
}
}
    for(i=1;i<7;i++)
{
    cout<<endl;
 
    printf("%d\t", A[i]);
    printf("%d\t", B[i]);   
    printf("%d\t", C[i]);
    printf("%d\t", D[i]);
    printf("%d\t", E[i]);
    printf("%d\t", F[i]);
}
    _getch();
 
    printf("\n");
 
    printf("Random number: %d\n", rand() %10);
    srand ( 1 );
 
}
#include <iostream>
using namespace std;
 
int Min(const int *Numbers, const int Count)
{
    int Minimum = Numbers[0];
 
    for(int i = 0; i < Count; i++)
        if( Minimum > Numbers[i] )
            Minimum = Numbers[i];
 
    return Minimum;
}
 
double Min(const double *Numbers, const int Count)
{
    double Minimum = Numbers[0];
 
    for(int i = 0; i < Count; i++)
        if( Minimum > Numbers[i] )
            Minimum = Numbers[i];
 
    return Minimum;
}
 
int main()
{
    int Nbrs[] = {                    };    
                int Total = sizeof(Nbrs) / sizeof(int);
 
    int Minimum = Min(Nbrs, Total);
    cout << "Minimum: " << Minimum << endl;
 
    return 0;
}

[rhitam30111985]

int main()
{
int Nbrs[] = { };
int Total = sizeof(Nbrs) / sizeof(int);

int Minimum = Min(Nbrs, Total);
cout << "Minimum: " << Minimum << endl;

return 0;
}

dunno what ur trying to do here but assuming u wanna find the minimum value in a two dimensional array .. just assign the first element of the first row A[0][0] and iterate thru the matrix and compare each element with this value.. if u find a smaller value then store it in the variable ... something like this:

int i,j,small=Nbrs[0][0];
for(i=0;i<ROWS;i++)
        for(j=0;j<COLUMNS;j++)
                if(Nbrs[i][j]<small)
                           small=Nbrs[i][j]
 

this should work

[sicarie]

dear sicarie,

if i delete conio.h, it will be error, and if i change _getch into printf, undeclaire, so what must I do?

printf() is a C function, try a cin. You would have to press 'enter', but you could always do a print statement saying "Press enter to continue".

[keith katthy]

Sorry, I do the mistake, actually I dont want the to make a random number, but i want to choose the minimum values from the matrix that I have done? How to call the number that i done?

>#include 
>#include 
>#include 
>#include 
>#include 
>#include 
>using namespace std;
 
 
 
 
> int i, j;
> int x[10];
> int A[10], B[10], C[10], D[10], E[10], F[10];
>
> int main(void)
>{
>{
> for(i=1;i<7;i++)
>
>{
> for(i=1;i<7;i++)
>{
> x[i]=i;
> A[i]=(2+pow(x[i],2));
> B[i]=(1+pow(x[i],3));
> C[i]=(2+pow(x[i],2)-1);
> D[i]=(3*pow(x[i],3));
> E[i]=(1+pow(x[i],2));
> F[i]=(3+pow(x[i],2));
>}
>{
> printf("\n");
>
> for(i=1;i<7; i++)
>
>{
> printf("[%d][%d] A[%d]=%d\n", i,1, i, A[i]);
>}
> printf("\n");
> for(i=1;i<7; i++)
>
>{
> printf("[%d][%d] B[%d]=%d\n", i,2, i, B[i]);
>}
> printf("\n");
> for(i=1;i<7; i++)
>
>{
> printf("[%d][%d] C[%d]=%d\n", i,3, i, C[i]);
>}
> printf("\n");
> for(i=1;i<7; i++)
>
>{
> printf("[%d][%d] D[%d]=%d\n", i,4, i, D[i]);
>}
> printf("\n");
> for(i=1;i<7; i++)
>
>{
> printf("[%d][%d] E[%d]=%d\n", i,5, i, E[i]);
> }
> printf("\n");
> for(i=1;i<7; i++)
>
>{
> printf("[%d][%d] F[%d]=%d\n", i,6, i, F[i]);
>}
>}
>}
>}
> for(i=1;i<7;i++)
>{
> cout<>
> printf("%d\t", A[i]);
> printf("%d\t", B[i]);
> printf("%d\t", C[i]);
> printf("%d\t", D[i]);
> printf("%d\t", E[i]);
> printf("%d\t", F[i]);
>}
> _getch();
>
 
 
>}
 
 
 
 
>[1][1] A[1]=3
>[2][1] A[2]=6
>[3][1] A[3]=11
>[4][1] A[4]=18
>[5][1] A[5]=27
>[6][1] A[6]=38
>[1][2] B[1]=2
>[2][2] B[2]=9
>[3][2] B[3]=28
>[4][2] B[4]=65
>[5][2] B[5]=126
>[6][2] B[6]=217
>[1][3] C[1]=2
>[2][3] C[2]=5
>[3][3] C[3]=10
>[4][3] C[4]=17
>[5][3] C[5]=26
>[6][3] C[6]=37
>[1][4] D[1]=3
>[2][4] D[2]=24
>[3][4] D[3]=81
>[4][4] D[4]=192
>[5][4] D[5]=375
>[6][4] D[6]=648
>[1][5] E[1]=2
>[2][5] E[2]=5
>[3][5] E[3]=10
>[4][5] E[4]=17
>[5][5] E[5]=26
>[6][5] E[6]=37
>[1][6] F[1]=4
>[2][6] F[2]=7
>[3][6] F[3]=12
>[4][6] F[4]=19
>[5][6] F[5]=28
>[6][6] F[6]=39
 
 
>3 2 2 3 2 4
>6 9 5 24 5 7
>11 28 10 81 10 12
>18 65 17 192 17 19
>27 126 26 375 26 28
>38 217 37 648 37 39
>
>