Dear all,

How can solve this problem
1) \nabla(S.\nabla phi)=source
where S is a 2 by 2 matrice?
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.

Franck

Regards.




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Franck Kalala Mutombo
[EMAIL PROTECTED]
African Institut for Mathematical Sciences, Muizenberg Cape Town, South
Africa
[EMAIL PROTECTED]
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