sorry about the confusion. the first program is the label points I expect, I labelled all points with y greater than 2 by using their corresponding ID. however, once the data is grouped into different categoies, as it is shown in the second program. There are three species in IRIS data, and they will be marked as three different color and shapes. In that case, if I want to label all points with y greater than 60 by using their corresponding ID, I can't get the label as the previous example. Hopefully I clearly express my concern, any suggestion will be appreciated.
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