CFD Online Discussion Forums - Reference to portions of a field

Hello to all,

I would like to know if the following is possible:

If I create a tensorField:

Code:

volTensorField gradU = fvc::grad(U);        



tensorField gradU_Internal = gradU.internalField();

Is it possible to create a new vectorField with references to selective entries in the tensorField?

Code:

vectorField a = SomeFunctionToSelectTensorField(0,1,2);

vectorField b (gradU_Internal.size(), {3,3,3});

a += b; // should change the 0,1,2 entries in the tensorField.

Edit: To complement, a C++ example:

Code:

#include <vector>

#include <iostream>

using namespace std;



int main(int argc, char** argv)

{



    vector<double> a = {1,2,3,4,5};

    vector<std::reference_wrapper<double>> b ={a[0], a[1], a[2]};



    vector<double> c = {1,2,3};



    for(int i = 0; i < 3; i++)

    {

        b[i] += c[i];

    }



    cout << "Done" << endl;

   return(0);

}