int HYPRE_AMSConstructDiscreteGradient (HYPRE_ParCSRMatrix A, HYPRE_ParVector x_coord, int *edge_vertex, HYPRE_ParCSRMatrix *G)

Construct and return the discrete gradient matrix G using some edge and vertex information

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Construct and return the discrete gradient matrix G using some edge and vertex information. We assume that edge_vertex lists the edge vertices consecutively, and that the orientation of edge i depends only on the sign of edge_vertex[2*i+1] - edge_vertex[2*i].

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