fv_element_mean.m

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function Umean = fv_element_mean(model, model_data, U,I)
% function Umean = fv_element_mean(model, model_data, U,I)
% function computing the element averages of a discrete function U
% in the grid elements with indices I. Most arguments are dummy,
% but required for more general discrete functions, e.g. p1, etc.

% Bernard Haasdonk 16.5.2007

Umean = U(I);