problem with 3D PDE

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Author Message   weissb (weissb) New member Username: weissb Post Number: 2 Registered: 09-2009 Posted on Sunday, September 13, 2009 - 11:14 pm:    Hi my equation is (x^2-y^2-z^2)*dx(f)- 2*x*y*dy(f)+ 2*x*z*dz(f)=0 Boundary condiction is When x^2+ 2*y^2+ 3*z^2=5, dx(f)=0, and x^2+ 2*y^2+3*z^2=4 dy(f)=0 ------------------------------- some program EQUATIONS f: (x^2-y^2-z^2)*dx(f)- 2*x*y*dy(f)+ 2*x*z*dz(f)=0 v: x^2+ 2*y^2+3*z^2=5 w: x^2+ 2*y^2+3*z^2=4 EXTRUSION surface z = -2*sqrt(R^2 - ( x^2 + y^2) ) surface z = 2*sqrt(R^2 -( x^2 + y^2) ) BOUNDARIES ? ------------------------------- How to write program with boundaries?   Jerry Brown (jerrybrown11743) Member Username: jerrybrown11743 Post Number: 55 Registered: 03-2004 Posted on Wednesday, September 16, 2009 - 09:23 pm:    There are plenty of examples to look at in the "samples" folder.