Re: newbie: computing rational numbers and decimal
- To: mathgroup at smc.vnet.net
- Subject: [mg30794] Re: newbie: computing rational numbers and decimal
- From: Ignacio Rodriguez <ignacio at sgirmn.pluri.ucm.es>
- Date: Wed, 19 Sep 2001 00:16:33 -0400 (EDT)
- Organization: UCM
- References: <9naldr$np6$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Alan Tu wrote:
1. The function you are looking for is N. For example:
N[{2/3,3/7},20] gives {0.6666666666666666667,0.4285714285714285714}
> Thanks Bob and Allan for answering my question on summing lists. I have
> another question. Suppose I have a sorted list (using union) of rational
> numbers. Is there a function that calculates those rational numbers to a
> given decimal position, preferably a listable function so I don't have to
> operate in a loop?
2. Union itself eliminates these duplicates:
Union[{2/3,2/3}] gives {2/3}
>
>
> Also, suppose that I have done that and now have a list of (still sorted, I
> think) decimal representations. Is there a quick way to remove any
> duplicates in this list, or do I have to use a loop and test equality each
> part of the list to the next part?
>
> Thanks again! I really appreciate it!
>
> Alan
--
Ignacio Rodriguez Ramirez de Arellano
Unidad de RMN
Universidad Complutense
Paseo Juan XXIII, 1
Madrid 28040, Spain
Tel. 34-91-394-3288
Fax 34-91-394-3245
e-mail: ignacio at sgirmn.pluri.ucm.es