Ex8 and minor improvements

sheet3/8/jacsolve.h

@@ -0,0 +1,18 @@
+#ifndef JACSOLVE_FILE
+#define JACSOLVE_FILE
+#include "getmatrix.h"
+#include <vector>
+
+
+/**
+ * Solves linear system of equations  K @p u = @p f  via the Jacobi iteration.
+ * We use a distributed symmetric  CSR matrix @p SK and initial guess of the
+ * solution is set to 0.
+ * @param[in] SK	CSR matrix
+ * @param[in] f		distributed local vector storing the right hand side
+ * @param[out] u	accumulated local vector storing the solution.
+*/
+void JacobiSolve(CRS_Matrix const &SK, std::vector<double> const &f, std::vector<double> &u);
+
+
+#endif