By "display", I mean show a color map. It's not quantitative, but it can be useful to understand the stencil being generated.
> On Jan 12, 2017, at 10:53 AM, Guyer, Jonathan E. Dr. (Fed) > <jonathan.gu...@nist.gov> wrote: > > 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 ] _______________________________________________ fipy mailing list fipy@nist.gov http://www.ctcms.nist.gov/fipy [ NIST internal ONLY: https://email.nist.gov/mailman/listinfo/fipy ]
