Requests for waffles_transform

[Anonymous]

A couple requests--not a big deal as it's pretty easy to code these myself
outside of waffles, but would help with completeness:

1. It would be handy to have an option in waffles_transform along the lines of dropmissingvalues that would drop any column whose values are all identical.
2. Rebuild the list of class values for a nominal attribute from the values in that column.

On both of the above, my issue is that I'm finding that after I do a split on
an arff dataset, I have some redundant columns/attributes.

Thanks!

[Mike Gashler]

1 sounds pretty easy to implement. I don't quite understand #2. Could you

elaborate on what it does and how that differs from what you would prefer?

[Anonymous]

I'd rephrase #2 as: Remove class values for categorical attributes that are no
longer present in that column.

For instance, suppose you have file1.arff that starts out with the attribute:

@ATTRIBUTE people {Alice, Bob, Charlie}

Now I do some sort of split on the file1.arff producing file2.arff. In
file2.arff, I only have "Bob" and "Charlie" in this column. What I'd like is a
command in waffles_transform that will reset the ATTRIBUTE list to just say

@ATTRIBUTE people {Bob, Charlie}

Thanks,

SeattleDad

[Nobody/Anonymous]

ok, I added both features. Here is example usage:

waffles_transform drophomogcols mydata.arff

and

waffles_transform dropunusedvalues mydata.arff