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Newb question: grouping selected nominal values
I have a data set with a type attribute and there are three main types and about 15 minor types.
I want to rename nearly all the minor types to 'other'. I've managed to do this using the AttributeValueMapper (though it seems a bit cumbersome, having to an AttributeValueMapper for each of the types -- is there a better way?). However, when I come to plot the options I run into difficulties, particularly with the legend, getting the error:
"Plotter: cannot draw nominal legend since number of different values is too high (more than 20)! Using numerical legend instead." The problem seems to be that it wants to plot the types that have been replaced by 'other
How do I 'lose' the possible nominal values that have now been converted to 'other'? Is it possible?