Matrix Problem

[superselo99]

B MATRİX

a b c d
e f g h
i j k l

C MATRİX
w x
y z

A MATRİX

aw+bx+ey+fz , bw+cx+fy+gz , cw+dx+gy+hz

ew+fx+iy+jz , fw+gx+jy+kz , gw+hx+ky+lz




I could not
how do I write a code to create a matrix ?

[lastchance]

how do I write a code to create a matrix

vector< vector<double> > M;

[keskiverto]

"to create"?

As in "container to store N values".
or
As in "to compute A = func( B, C )"?

[lastchance]

Did you mean:

#include <iostream>
#include <vector>
using namespace std;

using matrix = vector< vector<double> >;


//======================================================================


matrix weighted( const matrix &base, const matrix &mask )
{
   int brows = base.size(), bcols = base[0].size();
   int mrows = mask.size(), mcols = mask[0].size();
   int rows = brows - mrows + 1;
   int cols = bcols - mcols + 1;

   matrix result( rows, vector<double>( cols, 0 ) );
   for ( int i = 0; i < rows; i++ )
   {
      for ( int j = 0; j < cols; j++ )
      {
         for ( int ii = 0; ii < mrows; ii++ )
         {
            for ( int jj = 0; jj < mcols; jj++ ) result[i][j] += base[i+ii][j+jj] * mask[ii][jj];
         }
      }
   }

   return result;
}


//======================================================================


void print( const matrix &M )
{
   for ( auto &row : M )
   {
      for ( auto e : row ) cout << e << '\t';
      cout << '\n';
   }
}


//======================================================================


int main()
{
   matrix B = { { 1,  2,  3,  4 },
                { 5,  6,  7,  8 },
                { 9, 10, 11, 12 } };
   matrix C = { { 0.2, 0.3 },
                { 0.4, 0.1 } };

   matrix A = weighted( B, C );
   print( A );
}

3.4	4.4	5.4	
7.4	8.4	9.4	

[superselo99]

I mean, how can I write this code more simply

[lastchance]

WHAT code more simply?

We haven't really got any idea what you are trying to do and you haven't provided any code to make more "simple".

[superselo99]

excuse me you have a point there!