MaplePrimes - answers and comments on Question, How do I expand f(x,V(g(x))) in terms of x?

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Markiyan Hirnyk — Thu, 16 Aug 2012 22:24:23 Z

How about this?

> taylor(f(x, V(g(x))), x, 3);

It looks like I've solved my problem. Long

arsolomon — Fri, 17 Aug 2012 02:01:08 Z

It looks like I've solved my problem. Long story short, I was jumping through some funny hoops in an attempt to define dV/dtheta (i.e. differentiate w.r.t a function) using diff, when I needed to use D (and indeed the answer I got with diff was completely incorrect). As of now series seems to be automatically doing what I want, although I'm going to do some more testing to check. Thanks to all for your help!

Thanks a lot. I didn't know about the taylor command

arsolomon — Fri, 17 Aug 2012 00:26:40 Z

Thanks a lot. I didn't know about the taylor command (still learning Maple). I need to play around with this a bit to fit it into my application (since I presented a slightly simplied version) and I'll let you know what I find.

Question: I tried naively plugging it into what I was doing and it gave the same result as series did, I think because I have my functional dependences defined funny. Do I need to have f defined as f(x, V(g(x))? Right now it's just f(x).