Actually I was talking about this thing explained on page number 8 of this document.
http://see.stanford.edu/materials/aimlcs229/cs229-notes1.pdf I think implementation of this thing maybe a good start for fixing issue 2759. -Saurabh On Apr 23, 4:21 pm, Alan Bromborsky <abro...@verizon.net> wrote: > On 04/23/2013 12:32 AM, Aaron Meurer wrote: > > > > > > > > > Is this the same thing as the matrix derivative described in the > > matrix cookbook (see > >https://code.google.com/p/sympy/issues/detail?id=2759)? If so, then > > the answer is no. > > > Aaron Meurer > > > On Sun, Apr 21, 2013 at 7:28 AM, Saurabh Jha <saurabh.j...@gmail.com> wrote: > >> Hi, > > >> I wanted to know if something like this is already implemented in > >> sympy? > > >> for a function f: R(m × n)--> R mapping from mapping from m × n > >> matrices(let's say A) to real numbers than, > > >> ∇Af(A) =[∂f/∂A(11).............∂f/∂A(1n) ] > >> [ ] > >> [ ] > >> [∂f/∂A(n1)..............∂f/∂A(nn)] > > >> Note: with ∇Af(A), I meant taking gradient of f(A) with respect to > >> matrix A and with ∂f/∂A(11), I meant taking derivative of function f > >> with respect to element A(11) of matrix A. > > >> -Saurabh Jha > > >> -- > >> 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 sympy+unsubscr...@googlegroups.com. > >> To post to this group, send email to sympy@googlegroups.com. > >> Visit this group athttp://groups.google.com/group/sympy?hl=en-US. > >> For more options, visithttps://groups.google.com/groups/opt_out. > > Are you talking about the directional derivative of a matrix where if A > is a matrix and f(A) is a function of the matrix then > > B\cdot\partial_{A}f = \lim_{h \rightarrow 0} f(A+hB) > > so if A is a m x n matrix you simply regard the matrix as a vector of > length m x n. The dot product is defined for > m x n vectors. -- 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 sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at http://groups.google.com/group/sympy?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
