In addition to this, if you define an environment variable FIPY_DISPLAY_MATRIX, then FiPy will display the matrix and RHS vector. If FIPY_DISPLAY_MATRIX contains "terms", then the contribution of each term will be displayed before the aggregate matrix and vector are displayed. If FIPY_DISPLAY_MATRIX contains "print", then the numerical values of the matrix and vector will be printed to the shell. This is overwhelmingly useless for any but very tiny meshes.
> On Jan 12, 2017, at 10:27 AM, Daniel Wheeler <daniel.wheel...@gmail.com> > wrote: > > Hi Krishna, > > Yes you can do this, see > > https://github.com/usnistgov/fipy/blob/develop/fipy/terms/term.py#L332 > > The following should work, > > equation.cacheMatrix() > equation.solve(...) > the_matrix = equation.matrix > > The cacheMatrix is require because otherwise the reference to the > matrix is lost. > > I'm not exactly certain on the matrix format, but you should be able to do > > np.arrray(the_matrix) > > to make it into a 2D numpy array. > > Hope that helps. > > On Wed, Jan 11, 2017 at 3:39 PM, Gopalakrishnan, Krishnakumar > <krishnaku...@imperial.ac.uk> wrote: >> Hi, >> >> I was wondering if there is a way to access the internal matrices of the >> system of equations formulated by Fipy , given the coefficient terms of the >> general conservation equation. >> >> Let's say I have a simple diffusion equation (eg. Heat equation). I can >> hand-code the differentiation matrix and BC vector for a constant dx using >> the 2nd order central difference formula. >> >> Is there a way to see the matrix/vector system of the discretised system >> that FiPy has internally formed before we call solve() or sweep() ? I am >> still learning basics of discretisarion schemes and it will be helpful to >> visualise how FiPy internally forms the matrices, and how they compare to >> the hand-derived matrices/vectors >> >> Regards, >> >> Krishna >> >> >> _______________________________________________ >> fipy mailing list >> fipy@nist.gov >> http://www.ctcms.nist.gov/fipy >> [ NIST internal ONLY: https://email.nist.gov/mailman/listinfo/fipy ] >> > > > > -- > Daniel Wheeler > _______________________________________________ > fipy mailing list > fipy@nist.gov > http://www.ctcms.nist.gov/fipy > [ NIST internal ONLY: https://email.nist.gov/mailman/listinfo/fipy ] _______________________________________________ fipy mailing list fipy@nist.gov http://www.ctcms.nist.gov/fipy [ NIST internal ONLY: https://email.nist.gov/mailman/listinfo/fipy ]
