/usr/share/doc/freefem++/examples/examples++-tutorial/Laplace.edp is in freefem++-doc 3.19.1-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 | mesh Th=square(10,10);
fespace Vh(Th,P1); // P1 FE space
Vh uh,vh; // unkown and test function.
func f=1; // right hand side function
func g=0; // boundary condition function
problem laplace(uh,vh,solver=GMRES,tgv=1e5) = // definion of the problem
int2d(Th)( dx(uh)*dx(vh) + dy(uh)*dy(vh) ) // bilinear form
- int2d(Th)( f*vh ) // linear form
+ on(1,2,3,4,uh=g) ; // boundary condition form
laplace; // solve the problem plot(uh); // to see the result
plot(uh,ps="Laplace.eps",value=true);
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