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MathGroup Archive 2000

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Re: just doesn't work

  • To: mathgroup at smc.vnet.net
  • Subject: [mg25359] Re: [mg25346] just doesn't work
  • From: Andrzej Kozlowski <andrzej at tuins.ac.jp>
  • Date: Sun, 24 Sep 2000 03:01:28 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

on 00.9.23 4:36 PM, Borut L at justmyname at email.si wrote:

1. In[1]:=
Simplify[(4 a^3 b c K Pi Ro)/(15 r^3), {m == (4 a b c Pi Ro)/3}]

Out[1]=
 2
a  K m
------
    3
 5 r

2. 

In[2]:=
Simplify[a^2 b c + a b c]

Out[2]=
a (1 + a) b c

or just

In[3]:=
Factor[a^2 b c + a b c]

Out[3]=
a (1 + a) b c

You can't really make Mathematica arrange the output in the order you wrote
in your desired  without using HoldForm.



> 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.
> 
> e.g.
> 
> Bo[a^2 b c + a b c,a b c] - (would produce) - > a b c (a+1)
> 
> Collect[expr,{a,b,c}]
> just doesn't work.
> 
> 
> Borut, f.r.o.m. Slovenia
> 
> 
> 

-- 
Andrzej Kozlowski
Toyama International University, JAPAN

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