On Mon, Mar 16, 2009 at 9:14 PM, asmeurer <asmeu...@gmail.com> wrote: > > Laplace transforms are on your ideas list. Pardon me if I am slightly > ignorant, as we have just started learning about these, but part the > thing that makes Laplace transforms so great for solving ODEs is that > taking the Laplacian of a differential gives you back the initial > conditions of the function (assuming the solution doesn't grow faster > than e^x). So far, dsolve doesn't even include a way to include > initial conditions (another thing to implement). But yes, taking the > Laplacian of a regular function should be as simple as plugging it > into the definition, assuming sympy's integration engine can support > it (which it usually should, as most are just integration by parts > with simple improper limits). > > But never mind that. I think that I could fill a whole summer just > implementing what I have already learned, especially considering > things like variation of parameters and substitutions. > > I tried implementing that patch, but so far I am having a couple of > stumbling blocks. Pardon me again if I sound ignorant, but as I have > said, I have never worked with an open source project before. I have > also had very little experience with modules (basically, I was taught > them, but I have never tried to make any, and so I have forgotten how > they work). > > My problem is this: how do I edit the source so I can test it. So > far, the only way I can see to do this is to reinstall with setup.py > each time I make an edit, then reload python. Aside from having many > steps, this forces me to overwrite my released version of sympy with > the version that I am working on, which I don't necessarily want to > do. Is there a way I can test this from a separate directory. By the > way, I am running Mac OS X 10.5.
You can either install all the time and there are some convenience tools for that, e.g. setuptools inplace. I myself just develop in the tree, e.g. just download the git version of sympy and "import sympy". You execute tests using bin/test sympy > > Also, as I predicted, I am having difficulties understanding the match > function that the ODE solving functions use. How exactly does this > work? As far as I can tell, it returns a dictionary of the variables > of the function, but what are these set to. I probably could figure > this one out, but as I said above, I currently don't know how to test > this very efficiently. Just create a simple python script that imports sympy, put it into the sympy root directory and you can experiment. Or use ipython. > > And of course, if I actually manage to churn out something that works, > I have no idea how to submit it. http://docs.sympy.org/sympy-patches-tutorial.html#quick-start O. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sympy" group. To post to this group, send email to sympy@googlegroups.com To unsubscribe from this group, send email to sympy+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sympy?hl=en -~----------~----~----~----~------~----~------~--~---
