Dear deal II users, I have a deal II program that finds a solution u(x,y) of a scalar problem. I need to manipulate the solution to compute a 2D vector with components 1) du/dx - y 2) du/dy + x for every node of the domain. I am stuck because I am unable to find an easy way to perform such operation. Also it would be nice to be able to output it like a vector so that it can be properly visualized. Thank you very much for your help
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