compute_dz(self)
self.df is computed as weighted average of _triangles sharing a common node. On each triangle itri f is first assumed linear (= ~f), which allows to compute d~f[itri] Then the following approximation of df nodal values is then proposed: f[ipt] = SUM ( w[itri] x d~f[itri] , for itri sharing apex ipt) The weighted coeff. w[itri] are proportional to the angle of the triangle itri at apex ipt
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