Solving the Laplacian with P1 non conforming
\begin{array}{rcll} -\Delta u & =& 0 \quad & \mbox{on } \Omega=(0,1)^2,\\ u&=& x^2+2y^2, \quad &\mbox{on } \partial \Omega. \end{array}
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mesh Th=square(10,10); fespace Vh(Th,P1nc); Vh u,v; u=0; plot(u); func f= 0; func g= x*x+y*y*2; u=0; int i=0; // dcl the problem problem a(u,v,solver=CG,init=i) = int2d(Th)( dx(u)*dx(v) + dy(u)*dy(v)) + int2d(Th) ( v*f ) + on(1,2,3,4,u=g+i); cout << "-------------------" << i << endl; <<<<<<<<PLAYS NO ROLE i++; <<<<<<<<PLAYS NO ROLE a; // solve the problem cout << "-------------------" << endl; plot(u);