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RE: RE: Dealing with large data sets

  • To: mathgroup at smc.vnet.net
  • Subject: [mg43029] RE: [mg42969] RE: [mg42961] Dealing with large data sets
  • From: "txdiversity" <txdiversity at hotmail.com>
  • Date: Fri, 8 Aug 2003 00:26:45 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

I want to talk about my trial on this topic, and give some questions
that are very simple but are not got to me, very beginner on this
Mathematica.

> -----Original Message-----
> From: Owen, HL (Hywel) [mailto:H.L.Owen at dl.ac.uk]
To: mathgroup at smc.vnet.net
> Sent: Thursday, August 07, 2003 1:53 PM
> To: mathgroup at smc.vnet.net
> Subject: [mg43029] [mg42969] RE: [mg42961] Dealing with large data sets
> 
> Did you load a Statistics package first?
> 
> << Statistics`DescriptiveStatistics`
> 
> Also check your imported data is in number form rather than text, e.g.
> 
> Import[<datafile>,"List"], and then check using NumberQ, e.g.

[James] According to your guidelines, I did it as below and seem well
done it. However, I got simple questions: how to use NumberQ[] to check
with imported data, and how to plot it. Below are my scripts:

] << Statistics`DescriptiveStatistics`
] Directory[]
] SetDirectory["C:\users\mathematica"]
] A = Import["test.txt", "List"]
] Mean[A]
[James] It is almost well done until above line.
] A[1]     <-- I can not refer first element by this command, how to do
it?
] A(1)     <-- Neither even with this one.
] Plot(A) <-- Further, I can not draw graph it.

In brief, I mentioned my success of reading data and getting MEAN of
them based on the previous mail. In addition, I told, however, simple
questions: how to refer one element of imported data, and how to plot
these data.

-- 
Regards,
---
James (txdiversity at hotmail.com)
- Private opinions: This is not the opinion of my affiliation


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