trying to do some maths in Maxima, it is telling me "if a < 0 then b else if a = 0 then b else if a > 0 then b". b is my original input that I'm trying to get it to expand/rearrange. this is not useful. it shouldn't matter if it's even real or not, is just rearranging algebra (bivariate series)

got something to expand by limiting summation ranges to 3 instead of \infty. would have been nicer to get summations with binomial coefficients or what have you. this is an expansion of something done to $\sum{i,j} a_{i,j} c^i z^j$, and I want to collect up all the powers and find expressions for the new $a_{i,j}$ in terms of the previous ones. maybe I should try some other software, maxima is a pain

Follow

That expression is for A_n → A_{n+1}, which I already have code for (thanks to knighty) but what I'm really after today is something for A_n → A_{2n}.

Suppose
$$ A_n(c,z) = \sum a_{n,i,j} c^i z^j $$ and
$$ A_{2n} = A_n(c, A_n(c, z)) $$
find expressions for
$$ a_{2n,i,j} $$
in terms of
$$ a_{n,i,j} $$

nevermind. that approach violates the precondition that z (as argument to the outer A_n) is small when n is not a multiple of the periodic return to 0.

I think I want something more like $A_n(c, B_m(c, z))$ but I can't figure out if the order of A and B is conducive to what I'm trying to do... I don't think it commutes.

Sign in to participate in the conversation
post.lurk.org

Welcome to post.lurk.org, an instance for discussions around cultural freedom, experimental, new media art, net and computational culture, and things like that. This is part of a family of services that include mailing lists, group chat, and XMPP.