GFem language documentation -- 5.3 Complex number example

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## 5.3 Complex number example

    complex; nowait;
    border(1,0,1,10) begin x:=t; y:=0; end;
    border(1,0,1,10) begin x:=1; y:=t; end;
    border(2,0,1,10) begin x:=1-t; y:=1; end;
    border(1,0,1,10) begin x:=0; y:=1-t; end;
    buildmesh(200);

    solve(u)  /* observe than Re(u) = Im(u) */
    begin
         onbdy(1,2) u=0;
          pde(u) id(u)-laplace(u)=1+I ;
    end;
    v=Im(u);
     plot(u);plot(v);plot(u-v);