Yes, I know. I’ve downloaded (and paid some money for) SMath Studio. It’s very good, but it lacks some key features of Mathcad that I use extensively (so it has RKAdapt routines for example, but not the Odesolve routine).

However it does offer a lot, and it has a Linux version, so I do recommend it to those who don’t have Mathcad.

Also, the developer could use some more funds! I think I donated about $20, which is a painfully significant fraction of the $830 he claims to have received from donors. Some more donations would definitely help him expand the feature list.

Thanks for that link–you have some pretty impressive mathcad sheets there.

I actually use the symbolic engine in Mathcad to construct my financial flows ODEs with a very simple piece of code; but then I have to cut and paste from the matrix it develops. I’ll email an example to you shortly. I agree that others are far better at programmatic expression, but the beauty of Mathcad for me is the manner in which it replicates paper in its interface, and how easy it is to remember its syntax.

I’ve had a quick look, and what I might do is try simple TexMacs under Windows first of all simply as a LyX alternate to get a feel for it, and then if it seems workable, use that when I start writing Finance and Economic Breakdown properly next year and then do a full installation. I have a spare PC right now so I might make that a full Linux base machine (next year) and try with that.

For now I have to get this multi-sectoral stuff finished pronto, so working in what I know will be faster than learning a whole new system and restarting.

Here’s an example that includes TeXmacs display of “live” (algebraic) solutions of simple ODEs using Maxima (which is also available for Windows). It also interfaces direct to “R” which has comprehensive statistical stuff (free clone of “S”) highly relevant to economics and also to Matlab and Octave (free Matlab clone) with adequate numeric ODE solvers as well as to Sage (which itself interfaces to all 3 and SciPy numeric ODE solvers and matrix algebra etc and provides a superior combination environment).

The TeXmacs/Maxima example in 4th screenshot above is pretty similar to what you could get directly with TeXmacs/Sage numeric solutions of ODEs and looks to me pretty clearly superior to your Mathcad example.

Try TeXmacs first, simply as a general powerful scientific wordprocessor vastly superior to LyX et al and later add Sage. Even though Sage would be running on a virtual linux over windows it should still be just as easy and fast for it to communicate with Windows/Cygwin TexMacs as the interface is via network stack on “localhost” (and can also be made remotely accessible if you want).

BTW QtOctave GUI interface for Octave similar to the Matlab desktop is also available for Windows.

Likewise of course the normal “Notebook” browser interface to Sage is also via network to Firefox browser so despite the virtual linux for Sage itself you would be working entirely in your normal Windows environment apart from the initial hassles of setting it up.

The model starts with a single sector and then expands to multiple, but looking at the paper I didn’t document all the steps to the latter as well as I might have (it’s more a book length thing in that case). So the PDF should help. I’ll amend the post and put a link on my research page.

(Still confused by filenames)

(No error messages – consistent with site simply being overloaded – I have noticed it being very slow generally. You may need more bandwidth from hosting ISP generally due to increased traffic.)

Anyway, email them as well as fixing here if necessary and I’ll certainly be interested. Still no guarantee on how long it will take, so don’t wait to checkout Sage for yourself – but I was already thinking of using your earlier model for trying out Sage .