Modified Strongly Implicit Procedure of a ninepoint finitedifference representation.
I am looking for a code to solve a ninepoint finitedifference representation which arising from an elliptic PDE with crossderivitive.
A1(I,J)*F(I1,J1) + A2(I,J)*F(I ,J1) + A3(I,J)*F(I+1,J1) + A4(I,J)*F(I1,J ) + A5(I,J)*F(I ,J ) + A6(I,J)*F(I+1,J ) + A7(I,J)*F(I1,J+1) + A8(I,J)*F(I ,J+1) + A9(I,J)*F(I+1,J+1) = Q(I,J) Does anyone have it in hand or know where I can get it? For the algorithm, the Strongly Implicit Procedure of Stone(1968, SIAM J. Numer. Anal., vol.5, 5309) is preferred but other is also welcome. I know the Modified Strongly Implicit (MSI) procedure (Schneider & Zedan, 1981, Numer. Heat Transfer, vol.4,119). Is there one here who knows it? Any information is appreciated. Zhong 
Re: Modified Strongly Implicit Procedure of a ninepoint finitedifference representation.
SIP is in the NAG library, which is not in the public domain. A SIP code is also (freely available) in the code which accompanies the book by Ferziger and Peric (Springer Verlag ISBN 3540594345). There is SIP for 2D and 3D problems (though only 5 and 7 points moleculs) and vectorized 3D version. To get the code: 1) ftp to ftp.springer.de 2) cd pub/technik/peric 3) get read.me and read the instructions there

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