Re: Select columns weka wrapper

> I load an arff file like this
>
> dat = loader.load_file("vila_car_att.arff")
>
> However, I would like to select a given columns. I've tried:
>
> dat['lat']
>
> but I get this error:
>
> TypeError: 'Instances' object is not subscriptable

pww3 wraps the Weka API. The documentation for the Instances class is here:
http://fracpete.github.io/python-weka-wrapper3/weka.core.html#weka.core.dataset.Instances

> Any way of subsetting?

What are you trying to achieve? Creating subsets of columns? Then you
need to apply filters, e.g., the
weka.filters.unsupervised.attribute.Remove filter (use the -V flag to
invert which columns get removed).

Example usage:
http://fracpete.github.io/python-weka-wrapper3/examples.html

Repository with examples:
https://github.com/fracpete/python-weka-wrapper3-examples

Cheers, Peter
-- 
Peter Reutemann
Dept. of Computer Science
University of Waikato, NZ
+64 (7) 577-5304
http://www.cms.waikato.ac.nz/~fracpete/
http://www.data-mining.co.nz/
_______________________________________________
Wekalist mailing list -- [email protected]
Send posts to [email protected]
To unsubscribe send an email to [email protected]
To subscribe, unsubscribe, etc., visit https://list.waikato.ac.nz/postorius/lists/wekalist.list.waikato.ac.nz
List etiquette: http://www.cs.waikato.ac.nz/~ml/weka/mailinglist_etiquette.html