kernel iteration through for loop

Just wondering is there a way of generating dynamic variable in C++

For example could you write a function where you define a kernel size i.e. 3×3 5×5 7×7 and the function
dynamically generate the kernel rather that hand coding it as below

Code:

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array[row-1][col-1]
array[row-1][col]
array[row-1][col+1]

array[row][col-1]
array[row][col]
array[row][col+1]

array[row+1][col-1]
array[row+1][col]
array[row+1][col+1]

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This kernel would then be used to iterate through a for loop to calculate the average around row col value


May not be that clear, and I do apologise

You're right, that wasn't particularly clear! Don't know if this will help, or even if its on the right track:

Code:

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#include <iostream>
 #include <iomanip>
 
 int main(void)
 {
  int array[3][3];
 
  for (int i = 0; i < 3; i++)
  {
    for (int j = 0; j < 3; j++)
    {
      array[i][j] = i * 10 + j;
    }
  }
 
  for (int i = 0; i < 3; i++)
  {
    for (int j = 0; j < 3; j++)
    {
      std::cout <<"array[" <<i <<"][" <<j <<"] = "
                <<std::setw(2) <<std::setfill('0')
                <<array[i][j] <<std::endl;
    }
  }
 
 
  return(0);
 }
 
  /*
  Output:
 
  array[0][0] = 00
  array[0][1] = 01
  array[0][2] = 02
  array[1][0] = 10
  array[1][1] = 11
  array[1][2] = 12
  array[2][0] = 20
  array[2][1] = 21
  array[2][2] = 22
 
  */

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If you want dynamic sized arrays, use new/delete, or an STL container (eg vector)

Here is some of the code I've written

Code:

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if(BoundryKernal==3){
    std::cout<<"\n Kernal size 3";
      for (int plane=0; plane<1; ++plane) {
        for (int col=1; col<numCols-1; ++col) {
                        for (int row=1; row<numRows-1; ++row) {

                        SpatialSumCell[index][col][row]=(array[index][col-1][row-1]+array[index][col-1][row]+array[index][col-1][row+1]+array[index][col][row-1]+array[index][col][row]+array[index][col][row+1]+array[index][col+1][row-1]+array[index][col+1][row]+array[index][col+1][row+1])/9;
                                                  }
        }
      }//end if statement boundrykernal==3
  }//end if

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What i was wondering is it possible to dynamically create these array[][] varibles for example a 5 or 7 cell kernel using C++ while also being able to control the indexing on the array[][] i.e

Code:

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 array[col-?][row-?]

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Im not exactully not sure what you are trying to do but maybe you want to look into the STL
heres a link
http://www.msoe.edu/eecs/ce/courseinfo/stl/index.htm

>>What i was wondering is it possible to dynamically create these array[][] varibles
Yes, of course.

Code:

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int **array = new int*[rows];
for (int x = 0; x < rows; x++) {
  array[x] = new int[cols];
}

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This creates a simulated array of arrays using dynamic memory. To release the memory you perform the same operations in reverse using delete.

Code:

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for (int x = 0; x < rows; x++) {
  delete [] array[x];
}
delete [] array;

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However, managing your own memory is error prone. A better soution is to use the standard vector container given to you by the standard C++ library.

Code:

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#include <iostream>
#include <vector>

int main()
{
  std::vector< std::vector<int> > v;

  v.push_back(std::vector<int>(5, 10));
  v.push_back(std::vector<int>(5, 20));
  v.push_back(std::vector<int>(5, 30));
  for (int x = 0; x < 3; x++) {
    for (int y = 0; y < 5; y++) {
      std::cout << v[x][y] << ' ';
    }
    std::cout << std::endl;
  }

  return 0;
}

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