Mercurial > matrix-functions
view toolbox/poisson.m @ 2:c124219d7bfa draft
Re-add the 1995 toolbox after noticing the statement in the ~higham/mctoolbox/ webpage.
author | Antonio Pino Robles <data.script93@gmail.com> |
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date | Thu, 07 May 2015 18:36:24 +0200 |
parents | 8f23314345f4 |
children |
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function A = poisson(n) %POISSON Block tridiagonal matrix from Poisson's equation (sparse). % POISSON(N) is the block tridiagonal matrix of order N^2 % resulting from discretizing Poisson's equation with the % 5-point operator on an N-by-N mesh. % Reference: % G.H. Golub and C.F. Van Loan, Matrix Computations, second edition, % Johns Hopkins University Press, Baltimore, Maryland, 1989 % (Section 4.5.4). S = tridiag(n,-1,2,-1); I = speye(n); A = kron(I,S) + kron(S,I);