Subject: How to graph an expression involving sum?
From: dlakelan
Date: Thu, 08 Sep 2011 13:36:58 -0700
On 09/05/2011 01:08 PM, dlakelan wrote:
> I have a solution of a differential equation in terms of some fourier
> series. I would like to graph one of the spatially varying coefficients,
> so I tried something like:
....
> What's the right way to go about graphing something like this?
I should mention that I can do ev(coefseries,nouns) to convert the "sum"
noun into an enormous + expression, but this slows things down
considerably. If I am trying to simply do numerical calculations with
the expression, is there a faster way to get the evaluation than to
carry around a big symbolic expression? Is something like a lambda
expression like this the way to go?
lambda([x],ev(coefseries,avals,nouns,z=x,numer))
or does this just internally create and throw away the enormous +
expression?