Activity 3.5 - undoing/removing effect of filter

[Birone L]

I was trying to use "Remove filter" (bottom of the Filter -> Choose dialog). This doesn't appear to work - it didn't change the class attributes back to the original frequencies.

It took me a few (frustrated) minutes to notice the Undo button at the top of the Preprocess tab.

I also wonder how to remove filters individual - I seem to be missing something!

[Ian Witten]

On 22/03/2014, at 10:01 pm, Birone L <biron...@gmail.com> wrote:

I was trying to use "Remove filter" (bottom of the Filter -> Choose dialog). This doesn't appear to work - it didn't change the class attributes back to the original frequencies.

The function of the “Filter” and “Remove filter” buttons at  Filter -> Choose dialog is obscure — you should avoid them. Do you really want to know? — read on. The “Filter” button allows you to filter the filters that are shown. Open the list of unsupervised attribute filters in the “Choose” menu, click the “Filter” button at the bottom, and select “Nominal attributes”. Now two of the filters (KernelFilter and Wavelet) in the list of filters have turned gray to show that they’re now inapplicable. Now click the “Remove filter” button: selection you make with the “Filter” button has disappeared and these two filters are no longer gray. This facility filters the filters :-). Don’t worry about it; it’s almost never used.

To answer your question: you can’t undo the effect of filters individually. You can only undo the last one you applied, and then the previous one, etc.

cheers

ian

 

It took me a few (frustrated) minutes to notice the Undo button at the top of the Preprocess tab.

I also wonder how to remove filters individual - I seem to be missing something!

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