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To draw a matrix, one would require
at least one Row in the datasource
for each Mark on a view.
And i couldn't recommend trying to use
tricks involving data densification --
it would complicate matters a lot.
So i've ended up preparing a Scaffold datasource
to draw a matrix view, and used Data Blending
to aggregate Measures from the original datasource.
Here is the view (compare to the Average, a comparison to the Baseline is in the workbook, too):
Please find the attached.
Hope it could help a bit.