Convert variable to mixed element form

I am following the tutorial on transient Stokes solver. In the last code snippet, I find the following line:

w1[]=sol; u=w1; v= w2; p=wp;

which saves the solution from w1[] corresponding to a P2,P2,P1 mixed space to individual variables u,v,p corresponding to spaces in P2,P2,P1 respectively.

I want to do the opposite of it where I have variables in individual spaces and convert them to a combined mixed element space. I want to achieve this so that it becomes easier to write the data using ofstream and access it in another code.


It’s written in the same tutorial.

    Xh [w1, w2, wp] = [var1, var2, var3];
    cout << w1[] << endl;
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