Curious. Does anyone actually use sparse matrix? For the function bit just a note. MatrixExprs have a FunctionMatrix that accomplishes the same result with a Lambda. Should be fully compatible with normal matrices. On Jun 3, 2013 7:16 PM, "Aaron Meurer" <asmeu...@gmail.com> wrote:
> Well according to the pull request > https://github.com/sympy/sympy/pull/2152 there are some bugs. > Definitely there were a lot of bugs before, mostly because it wasn't > (and still isn't) very heavily used. > > Aaron Meurer > > On Mon, Jun 3, 2013 at 7:11 PM, Chris Smith <smi...@gmail.com> wrote: > > Yes, the callable could create only a few non-zero entries. And only the > > non-zero entries are retained in the SparseMatrix so it is reasonable to > > keep that code: > > > >>>> SparseMatrix(3,3,lambda i,j: 1 if i==j else 0) > > [1, 0, 0] > > [0, 1, 0] > > [0, 0, 1] > >>>> _._smat > > {(0, 0): 1, (1, 1): 1, (2, 2): 1} > > > > Again, the "else" part allows dense input that has few entries to be > stored > > in a compact way so there's no reason to disallow it AFAICT: > > > >>>> SparseMatrix([[0,0,1],[0,0,1]]) > > [0, 0, 1] > > [0, 0, 1] > >>>> _._smat > > {(1, 2): 1, (0, 2): 1} > >>>> SparseMatrix(3,3,lambda i,j: 1 if i==j else 0) > > > > (The bugginess that Aaron refers to is perhaps refering to the former > state > > of SparseMatrix; I think things are currently in pretty good shape.) > > > > -- > > You received this message because you are subscribed to the Google Groups > > "sympy" group. > > To unsubscribe from this group and stop receiving emails from it, send an > > email to sympy+unsubscr...@googlegroups.com. > > To post to this group, send email to sympy@googlegroups.com. > > Visit this group at http://groups.google.com/group/sympy?hl=en-US. > > For more options, visit https://groups.google.com/groups/opt_out. > > > > > > -- > You received this message because you are subscribed to the Google Groups > "sympy" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to sympy+unsubscr...@googlegroups.com. > To post to this group, send email to sympy@googlegroups.com. > Visit this group at http://groups.google.com/group/sympy?hl=en-US. > For more options, visit https://groups.google.com/groups/opt_out. > > > -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at http://groups.google.com/group/sympy?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
