Determine the groupings of values as they would be presented in the venn diagram.
A list of vectors (e.g., integers, chars), with each component corresponding to a separate circle in the Venn diagram
This function mostly complements the venn.diagram() function for the case where users want to know what values are grouped into the particular areas of the venn diagram.
Returns a list of lists which contain the values assigned to each of the areas of a venn diagram.
# A simple single-set diagram cardiome <- letters[1:10] superset <- letters[8:24] overlap <- calculate.overlap( x = list( "Cardiome" = cardiome, "SuperSet" = superset ) );
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