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MathGroup Archive 1998

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Re: Q: Linearization

  • To: mathgroup at smc.vnet.net
  • Subject: [mg15127] Re: Q: Linearization
  • From: Rolf Mertig <rolf at mertig.com>
  • Date: Wed, 16 Dec 1998 03:11:07 -0500
  • Organization: Mertig Research & Consulting
  • References: <754vm1$jgc@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Christoph wrote:
> 
>         Howdy,
> 
> is there any nice way to linearize an equation in Matematica?
> 
> e.g.:
> i have a function
> 
> f[x,y]
> 
> if i do
> Normal[Series[f[x,y],{x,0,1},{y,0,1}]]
> 
> i will still have a term containing x*y, but if x and y are small i can
> discard this term. Can mathematica discard term automaticly?
> 
> Christoph
> 
> PS:  THis is an example, I have a function with seven variables and
> don't wan't to pick the correct ones manualy.
> 
> PPS: could you pleas also mail me?

Normal[Series[f[x,y]/.{x:>z x, y:>z y},{z,0,1}]]/.z->1

-- 

Rolf Mertig
Mertig Research & Consulting  
Mathematica training and programming Development and distribution of
FeynCalc  Amsterdam, The Netherlands http://www.mertig.com


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