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String to nominal value in Weka

I have an ARFF file with a column of 32-bit hash values of type string. I am trying to convert it from string to nominal using the filters in in the Weka GUI (select all then filters > unsupervised > StringToNominal) but it doesn't seem to have any effect and remains type string. What am I doing wrong?

Solution

  • I left this answer for future references.

    You must specify the range of columns to which apply the selected filter. On the Weka interface, next to the "choose" button, click over the filter name and a configuration window will appear. Then, on the range attribute you can specify the columns number to which the filter will be applied. In this:
    this image the filter will be applied to the sixth attribute (UC). This is also observed in the weka command, in the argument -R.