I was wondering where do you make a suggestion for an additional package? I checked the FAQ and tried searching the sage website, but I never saw where to post a question/suggestion.
Anyways I have two; one might be question or a suggestion if sage doesn't support it. First, I am interested in a tool that performs matrix-calculus (see the matrix-cookbook - http://orion.uwaterloo.ca/~hwolkowi/matrixcookbook.pdf). For example I would want to take the symbolic derivative of the logarithm a multivariate normal distribution with respect to the covariance matrix. I know this specific example has been solved (I have even done it myself), but there are other uglier problems which I wish to check. I am wondering if Sage has this capability, and if so how would I use it? If sage does not have this capability, I would like to suggest it as a feature for one of its symbolic packages. Secondly, I was wondering if someone could integrate PyBrain (http://pybrain.org/pages/home) into Sage. Its licensed under the BSD license, so it should be able to become an optional package. Surprisingly this is related to my above question/suggestion. PyBrain has an optimization technique known as "Covariance Matrix Adaptation Evolution Strategy," (read more about it here http://www.mitpressjournals.org/doi/abs/10.1162/106365601750190398) which can be derived using matrix-calculus and natural-gradients (http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=675489&tag=1). -- You received this message because you are subscribed to the Google Groups "sage-support" 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/sage-support?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
