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
Paseo Juan XXIII, 1

Tel. 34-91-394-3288
Fax  34-91-394-3245
e-mail: ignacio at sgirmn.pluri.ucm.es

```

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