You simply need to output your predictions from the classification process. This can be done in the CLASSIFY tab, by clicking the MORE OPTIONS button, then in the OUTPUT PREDICTIONS option choose CSV, after that click on the CSV to specify path and additional options (See attached screenshot).

Once you have your predictions, you can merge your CSV files to have predictions and actual label. The scatterplot should give you the same result in excel. BUT you will not have the classes colored as in WEKA.

Hi,

We, in WEKA community, do that either through the code or through KnowledgeFlow platform using the associated package.

HTH.

Dr. Samer Sarsam