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Re: How to get result in shape of fraction in Mathematica 4.2

• To: mathgroup at smc.vnet.net
• Subject: [mg91599] Re: How to get result in shape of fraction in Mathematica 4.2
• From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
• Date: Thu, 28 Aug 2008 07:40:00 -0400 (EDT)
• Organization: The Open University, Milton Keynes, UK
• References: <g95k9b$54b$1@smc.vnet.net>

b wrote:

> When I calculate something I would like to get result in shape of fraction; 
> Like 1/2 not 0.5.
> 
> How??

The best method to get exact results is to use infinite precision 
numbers [1], i.e. 314/100 rather than 3.14 or 2 rather than 2. or 2.0

Also you could set system variables such as *$Post* [2] or $PrePrint to 
Rationalize (or Rationalize[#, 0]&).

   In[1]:= 1 - 1/2

   Out[1]= 1/2

   In[2]:= 2*314/100

   Out[2]= 157/25

   In[3]:= $Post = Rationalize;

   In[4]:= 1 - .5

   Out[4]= 1/2

   In[5]:= 2*3.14

   Out[5]= 157/25

   In[6]:= $Post =.;

Regards,
- Jean-Marc

[1] 
http://reference.wolfram.com/mathematica/tutorial/ArbitraryPrecisionNumbers.html

[2] http://reference.wolfram.com/mathematica/ref/$Post.html