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missing ordered type and can not discretize my label
i've got 3 problems. The first one is that i miss the attribute "ordered". In version 4.1 I've read timestamps from database and they attribute type was ordered. With version 4.2 the values are nominal. I tried to convert them with the nominal2date operator, but i have already missing values in this column. This operator throws an Error because they can not handle it. When there is no solution for this problem, I want to transform the timestamps in unix timestamps (integer).
The second problem I've got is that my label is numeric and i like to discretize them. But I have no Idea how? All descretize-operator don't handle special attributes.
Problem 3: Many, such as the BinDiscretization, affect all numeric columns, but why? I only want to operate on a specific column. How can I realise it?