Hi David, Thank you for your patches. Would you please mind sending them as a github pull request against the repository here:
https://github.com/sympy/sympy ? Also, can you send this email to the sympy mailinglist: http://groups.google.com/group/sympy That way more people will see it. We don't use this sympy-patches list anymore. Thanks! Ondrej On Thu, Aug 23, 2012 at 9:02 AM, David M. Rogers <predictivestatm...@gmail.com> wrote: > Hello, > > I've just started trying to use some of sympy's codegen features in an > attempt to create fast routines to output numpy arrays. It seems that not > all of the functionality is there at the moment and I have a few things on > my wishlist: > > 1. working fcode (and ccode/jscode) for Sum(expr, Tuple()) > a. a better method for determining output arguments than (somewhat > opaquely) scraping off a top-level Equality() class. > 2. re-working of the tensor class (which does some great things) to put it > in-line with numpy's array class: > a. removal of tensor contraction routines in favor of the Sum() class > b. combining Indexed and IndexedBase classes (I have a test version for > this) > c. changing semantics of tensor indices (Idx class) to simply use (start, > stop, step) to specify selected strides for each tensor dimension (note that > 12*A[2:4] dies with an error because Tuple cannot be ().expand()-ed) > > -- these last changes would remove a lot of the tensor functionality in > codegen in favor of some sophistication in translating "Sum"-s. However, > the code generation mechanism seems difficult to expand to me because I want > it to work with arrays ( i.e. numpy.array([Symbol('x')]) ), and because it > doesn't have a facility for injecting new variables to hold intermediate > steps in the computation. A lot more sophistication should go into creating > an internal representation before fcode() and friends get called, I.e. > creating a call graph from cse and optimizing the computation order of the > intermediate variables. > > This seems a bit far off, so I'm calling it quits for now and sending a > few helpful patches I made along the way. > > ~ David M. Rogers > Postdoc, Susan B. Rempe Lab > Sandia National Labs > > -- > You received this message because you are subscribed to the Google Groups > "sympy-patches" group. > To post to this group, send email to sympy-patches@googlegroups.com. > To unsubscribe from this group, send email to > sympy-patches+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msg/sympy-patches/-/Tdjw8loLZUsJ. > For more options, visit https://groups.google.com/groups/opt_out. > > -- You received this message because you are subscribed to the Google Groups "sympy-patches" group. To post to this group, send email to sympy-patches@googlegroups.com. To unsubscribe from this group, send email to sympy-patches+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
