Hi all, Thanks to all the contributors to SymPy - such a fantastic project.
The recent 1.9 update changed the internal implementation of the SparseMatrix class. This means pickle files of sparse matrices created with SymPy <=1.8 cannot be loaded by v1.9, and vice versa. The radioactivedecay <https://github.com/alexmalins/radioactivedecay> package distributes some pre-calculated SymPy sparse matices containing processed nuclear data as part of the package. Currently it uses pickle files for this, but I was wondering if there is a more robust alternative that is still efficient? I looked at saving srepr strings to a text file, then reloading through sympify. However srepr of a SparseMarix outputs the full matrix, including Integer(0)'s for every zero element. The results in large file sizes, with slow saving & loading. (radioactivedecay's sparse matrices are circa 1500x1500 in size with 99.7% sparsity, so it really kills performance) Is anyone aware of a better way to load and save SparseMatrix objects to files? -- 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 view this discussion on the web visit https://groups.google.com/d/msgid/sympy/aedb8a2b-a73c-4f1b-9248-ba1dcebd92dbn%40googlegroups.com.
