Eric, thanks for the suggestion. I already have input files in Python which I am fighting to output the simple text format I want but was hoping I could read the Matlab versions directly into J if a utility already exists. The Matlab .mat file spec seems straightforward but it may be simpler to wrestle Python into submission.
On Wed, Nov 15, 2023 at 10:24 AM Eric Iverson <eric.b.iver...@gmail.com> wrote: > Devon, > Python pandas can load matlab mat files. I think (but don't know) that it > would be fairly straightforward to use the Jd pandas support (for parquet > and other formats) to work with mat files. Google (pandas and matlab mat > files) and the Jd jdrt'pandas' tutorial might be a way forward. > > The Jd support would be very general if you are looking at reading/writing > many mat files. If this is a one time event there might be easier ways. > > On Tue, Nov 14, 2023 at 9:35 PM Devon McCormick <devon...@gmail.com> > wrote: > > > Thanks! I seem to recall writing a reader in APL or J a long time ago > and > > it was easy but I have no idea where the code is. > > > > On Tue, Nov 14, 2023 at 4:23 PM Jan-Pieter Jacobs < > > janpieter.jac...@gmail.com> wrote: > > > > > I was curious and googled around a bit, finding this pdf, maybe it > could > > > help in case you're wanting to implement a Mat file reader: > > > https://www.mathworks.com/help/pdf_doc/matlab/matfile_format.pdf > > > which describes mat file levels 5 and 4. It seems current as it's been > > > re-released in 2023. It looks a lot less complicated than what I > expected > > > :), but I never really needed it. > > > Jan-Pieter. > > > > > > On Tue, Nov 14, 2023 at 9:50 AM 'Mike Day' via General < > > > gene...@jsoftware.com> wrote: > > > > > > > Don't know, but Google tells me you can do so in R, and there's an R > > > > interface > > > > in addons/stats/r. Might get you started, > > > > > > > > Mike > > > > > > > > Sent from my iPad > > > > > > > > > On 14 Nov 2023, at 04:10, Devon McCormick <devon...@gmail.com> > > wrote: > > > > > > > > > > Has anyone written something to read Matlab ".mat" data files into > > J? > > > > > > > > > > Thanks... > > > > > > > > > > -- > > > > > > > > > > Devon McCormick, CFA > > > > > > > > > > Quantitative Consultant > > > > > > > ---------------------------------------------------------------------- > > > > > For information about J forums see > > http://www.jsoftware.com/forums.htm > > > > > ---------------------------------------------------------------------- > > > > For information about J forums see > http://www.jsoftware.com/forums.htm > > > > > > > ---------------------------------------------------------------------- > > > For information about J forums see http://www.jsoftware.com/forums.htm > > > > > > > > > -- > > > > Devon McCormick, CFA > > > > Quantitative Consultant > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > -- Devon McCormick, CFA Quantitative Consultant ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
