I guess I was thinking of https://en.wikipedia.org/wiki/Matrix_derivative. I didn't read it too closely, so I can't say too much about it. I was mostly just impressed that it kept track of the identities for both conventions.
Aaron Meurer On Sat, May 3, 2014 at 7:12 PM, Tim Lahey <[email protected]> wrote: > What's it categorized as in Wikipedia? I'll take a look. > > Cheers, > > Tim. > > > On 3 May 2014, at 20:07, Aaron Meurer wrote: > >> Wikipedia seemed to be OK the last time I looked at it. It even split >> things out based on the two Jabobian conventions. >> >> Aaron Meurer >> >> On Sat, May 3, 2014 at 5:06 PM, Tim Lahey <[email protected]> wrote: >>> >>> I commented on that issue. That result is actually correct. >>> >>> The problem I have with the matrix cookbook is that it's just a list of >>> results, with no explanation on how each are derived. I've never found a >>> good reference for this in general. If someone knows of one, I'd >>> appreciate >>> it. >>> >>> I think the latest version of the cookbook is slightly newer because >>> equation 61 doesn't match with the specific issue anymore. >>> >>> Cheers, >>> >>> Tim. >>> >>> >>> On 3 May 2014, at 14:47, Aaron Meurer wrote: >>> >>>> I think it's all explained in the matrix cookbook. See >>>> https://github.com/sympy/sympy/issues/5858. The question I have >>>> regarding the cookbook is, what is the minimum set of rules that need >>>> to be implemented from which the rest can be derived? >>>> >>>> Aaron Meurer >>>> >>>> On Mon, Apr 28, 2014 at 11:46 PM, Tim Lahey <[email protected]> wrote: >>>>> >>>>> >>>>> I know how to handle x.T*A and A*x, but I'm not sure how to handle the >>>>> derivative if it appears in the middle of an term. It probably can be >>>>> handled, but I think that case would get a bit messy. >>>>> >>>>> Cheers, >>>>> >>>>> Tim. >>>>> >>>>> >>>>> On 29 Apr 2014, at 0:01, Matthew Rocklin wrote: >>>>> >>>>>> I'd love to have someone implement matrix derivative. This shouldn't >>>>>> be >>>>>> hard for someone who understands them well. >>>>>> >>>>>> >>>>>> On Mon, Apr 28, 2014 at 7:37 PM, Aaron Meurer <[email protected]> >>>>>> wrote: >>>>>> >>>>>>> These little issues with the transpose are the reason this isn't >>>>>>> implemented yet. >>>>>>> >>>>>>> Aaron Meurer >>>>>>> >>>>>>> On Mon, Apr 28, 2014 at 2:18 PM, Tim Lahey <[email protected]> >>>>>>> wrote: >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> It's only 2*A*x is A is symmetric (A.T = A). Otherwise it's (A.T + >>>>>>>> A). >>>>>>> >>>>>>> >>>>>>> >>>>>>> That said, I don't think Matrix Expressions support derivatives at >>>>>>> the >>>>>>> moment. >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> Cheers, >>>>>>>> >>>>>>>> Tim. >>>>>>>> >>>>>>>> On 2014-04-28, at 1:27 PM, Gustavo <[email protected]> >>>>>>>> wrote: >>>>>>>> >>>>>>>>> Can I have matrices and vectors A and x with compatible but >>>>>>>>> unspecified >>>>>>> >>>>>>> >>>>>>> >>>>>>> dimensions. And get diff(x.T * A * x , x) return 2*A*x ? >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> Thanks, >>>>>>>>> Gustavo >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> -- >>>>>>>> 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 [email protected]. >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> To post to this group, send email to [email protected]. >>>>>>>> Visit this group at http://groups.google.com/group/sympy. >>>>>>>> To view this discussion on the web visit >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> https://groups.google.com/d/msgid/sympy/340D188D-2402-47E1-829B-1E42297C89BD%40gmail.com >>>>>>> . >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> For more options, visit https://groups.google.com/d/optout. >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> -- >>>>>>> You 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