The problem with three variables

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Author Message   shi liang (caleb_shi) New member Username: caleb_shi Post Number: 2 Registered: 12-2004 Posted on Tuesday, January 04, 2005 - 12:58 am:    Hello, I have three equations associated with three variables like: Phi:div(grad(Phi))+V*Phi= Lambda*Phi V: div(grad(V))=-D D: D=abs(Phi^2)*log10(1+exp(Ef-lambda)) Ef is a constant.I select "modes=1" and the boundary conditin is V=0 and Phi=0. but when I solve it, I got "internal processing error".Is it because I assign wrong equation to variables or I made wrong boundary conditions? Thanks for helping! the attachment is my program particals in two dimensions Assign_2_rectangular.pde (1.0 k)   Robert G. Nelson (rgnelson) Moderator Username: rgnelson Post Number: 295 Registered: 06-2003 Posted on Tuesday, January 04, 2005 - 02:07 pm:    What version of FlexPDE are you using? I ran this problem on version 4.2.6 without error. See attached.