converting a dataset

[Nancy Adam]

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Hi everyone,

Can anyone please tell me how I can convert a dataset.arff into .data?

Cheers,

Nancy

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[Peter Reutemann-3]

> Can anyone please tell me how I can convert a dataset.arff into .data?

Do you mean C4.5 format?

Either use the Explorer (load the ARFF file and save it as C4.5 file)
or use the following converter:
  java weka.core.converters.C45Saver -i <the_arff_file.arff> -o
<the_c45_file.data> -c <class_index>

Don't worry, if you can't specify a .names and .data file. Both of
them will get generated automatically.

Cheers, Peter
--
Peter Reutemann, Dept. of Computer Science, University of Waikato, NZ
http://www.cs.waikato.ac.nz/~fracpete/           Ph. [phone]

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[Nancy Adam]

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Hi all,

Thank you Peter so much for your reply.

Could you please tell me the difference between .data, .arff, .names and .dat? can I use any of them in java classifier program?

 

How can I partition dataset.arff into two files one for training and other one for testing?

Many thanks,

Nancy

 

> From: fracpete@...
> Date: Thu, 29 Oct 2009 09:20:13 +1300
> Subject: Re: [Wekalist] converting a dataset
> To: wekalist@...
>
> > Can anyone please tell me how I can convert a dataset.arff into .data?
>
> Do you mean C4.5 format?
>
> Either use the Explorer (load the ARFF file and save it as C4.5 file)
> or use the following converter:
> java weka.core.converters.C45Saver -i <the_arff_file.arff> -o
> <the_c45_file.data> -c <class_index>
>
> Don't worry, if you can't specify a .names and .data file. Both of
> them will get generated automatically.
>
> Cheers, Peter
> --
> Peter Reutemann, Dept. of Computer Science, University of Waikato, NZ
> http://www.cs.waikato.ac.nz/~fracpete/ Ph. [phone]
>
> _______________________________________________
> Wekalist mailing list
> Send posts to: Wekalist@...
> List info and subscription status: https://list.scms.waikato.ac.nz/mailman/listinfo/wekalist
> List etiquette: http://www.cs.waikato.ac.nz/~ml/weka/mailinglist_etiquette.html

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[Peter Reutemann-3]

Please no top-posting, see mailing list etiquette why
(http://www.cs.waikato.ac.nz/~ml/weka/mailinglist_etiquette.html).

> Could you please tell me the difference between .data, .arff, .names and
> .dat? can I use any of them in java classifier program?

They're just different data formats (just open them in a text editor
and you'll see the difference). And you need specific converters for
loading/saving them. ARFF is Weka's own (and preferred) data format.

> How can I partition dataset.arff into two files one for training and other
> one for testing?

I've added a new FAQ: How do I divide a dataset into training and test set?
Link to the FAQs available from the Weka homepage.

NB: The Explorer allows you to split a the currently loaded dataset
into a training and test set on-the-fly.

Cheers, Peter
--
Peter Reutemann, Dept. of Computer Science, University of Waikato, NZ
http://www.cs.waikato.ac.nz/~fracpete/           Ph. [phone]

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