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MathGroup Archive 2000

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Re: just doesn't work

  • To: mathgroup at smc.vnet.net
  • Subject: [mg25393] Re: just doesn't work
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Fri, 29 Sep 2000 01:06:26 -0400 (EDT)
  • Organization: Universitaet Leipzig
  • References: <8qho5p$j9s@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

a) Mathematica is a Computer Algebra -- *not* a text editor, vi is 
   a text editor and emacs
b)

expr = (4 a^3 b c K Pi Ro)/(15 r^3)

expr /. First[Solve[(4 a b c Pi Ro)/3 == m, Ro]]
c)

In[]:=MyFactor[expr_, q_] := q*Simplify[expr/q]

In[]:=MyFactor[a^2 b c + a b c, a b c]
Out[]= a (1 + a) b c

Regards
  Jens

Borut L wrote:
> 
> Helo,
> 
> I am writing a paper in Mathematica 4.0, and I found it to be very powerful
> text editor. However, I encountered some deadly problems, which I cannot
> solve. Thanks for any help!
> 
> 1. How can I replace a symbol m with (4 a b c Pi Ro)/3 in expr
> 
> (4 a^3 b c K Pi Ro)/(15 r^3)
> 
> expr/.(4 a b c Pi Ro)/3 -> m
> just doesn't work
> 
> 2. How Can I 'bring out' a defined part from a sum of two terms.
> 
> ] - (would produce) - > a b c (a+1)
> 
> Collect[expr,{a,b,c}]
> just doesn't work.
> 
> Borut, f.r.o.m. Slovenia


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