Many thanks for your message ans explanation. However I still have one question.
I had many problems to fix my fipy on vista and honestly I don't know exactly how to update the trunk you are talking about. May you give me simple steps on how to update easly? Franck, Regards 2008/8/18 Daniel Wheeler <[EMAIL PROTECTED]> > > On Mon, Aug 18, 2008 at 8:56 AM, franck kalala > <[EMAIL PROTECTED]> wrote: > > Dear all, > > > > How can solve this problem > > 1) \nabla(S.\nabla phi)=source > > where S is a 2 by 2 matrice? > > As I said, you will need to update to trunk and place the matrix as > the first element and only element in a higher order iterable. > > > 1) \nabla(\nabla phi)=source=q(phi) > > where source=q(phi)=charactristic function of the intervall [0.3,.7] > > how do I set a characteristic function in fipy ie my given source. > > Define the variable relationship and just add it as a source to the > equation with "+" or "-". > > Cheers > > -- > Daniel Wheeler > > -- *********************************************** *********************************************** Franck Kalala Mutombo [EMAIL PROTECTED] African Institut for Mathematical Sciences, Muizenberg Cape Town, South Africa [EMAIL PROTECTED] ************************************************ ************************************************
