.

Sheet7/E14/jacob_template/userset.h

@@ -0,0 +1,47 @@
+#ifndef USERSET_FILE
+#define USERSET_FILE
+#include <cmath>
+/**
+ * User function: f(@p x,@p y)
+ * @param[in] x		x-coordinate of discretization point
+ * @param[in] y		y-coordinate of discretization point
+ * @return  value for right hand side f(@p x,@p y)
+ */
+double FunctF(double const x, double const y);
+
+/**
+ * User function: u(@p x,@p y)
+ * @param[in] x		x-coordinate of discretization point
+ * @param[in] y		y-coordinate of discretization point
+ * @return  value for solution vector u(@p x,@p y)
+ */
+double FunctU(double const x, double const y);
+
+
+/**
+ * User function: f(@p x,@p y) = @f$ x^2 \sin(2.5\pi y)@f$.
+ * @param[in] x		x-coordinate of discretization point
+ * @param[in] y		y-coordinate of discretization point
+ * @return  value f(@p x,@p y)
+ */
+inline
+double fNice(double const x, double const y)
+{
+    //return x * x * std::sin(2.5 * M_PI * y);               // solution u
+    return std::sin(M_PI*2.5*y)*(M_PI*M_PI*2.5*2.5*x*x - 2); // -Laplacian(u)
+}
+
+/**
+ * User function: f(@p x,@p y) = 0$.
+ * @param[in] x		x-coordinate of discretization point
+ * @param[in] y		y-coordinate of discretization point
+ * @return  value 0
+ */
+inline
+double f_zero(double const x, double const y)
+//double f_zero(double const  /*x*/, double const /*y*/)
+{
+    return 0.0 + 0.0*(x+y);
+}
+
+#endif