How to write functions returning Eigen types?

I'm C++ Newbie.

I made a function that generates Matrix using Eigen library, but I can't return it.

The code is long, but it won't be difficult for you to understand.

How to write functions returning Eigen types?

Also, I would appreciate it if you could tell me how to return the vector by calling it as a function.

Thanks all

int Design(int x ,int y)   {      MatrixXd A = MatrixXd(x, y);       for (int row = 0; row < x; row++)       {          for (int col = 0; col < y; col++)          {              A(row, col) = 7;                if (row % 2 == 0)              {                  A(row, 0) = 1;                    if (col % 2 == 0)                  {                      A(row, 1) = 0;                      A(row, 3) = 0;                    }                  A(row, 5) = 0;                    if (col == 2)                  **{                      A(row, 2) = -(row + 1) * 0.2;                  }                  if (col == 4)                  {                      A(row, 4) = (row + 1) * 0.3;                  }              }              if (row % 2 == 1)              {                  A(row, 1) = 1;                  if (col % 2 == 1)                  {                      A(row, 0) = 0;                      A(row, 2) = 0;                      A(row, 4) = 0;                  }                  if (col == 5)                  {                      A(row, 5) = row * 0.2;                  }                  if (col == 3)                  {                      A(row, 3) = row * 0.3;                  }              }          }      }      return A; //error  }  

https://stackoverflow.com/questions/66539386/how-to-write-functions-returning-eigen-types March 09, 2021 at 09:08AM