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