Difference - Function Summary
Return the difference of two data sets.
difference set1 set2
set1 - First data set (must be: series bitset date)
set2 - Second data set (must be: series bitset date)
/case - Uses case-sensitive comparison.
/skip - Treat the series as records of fixed size
size - The size argument. (must be: integer)
Returns the elements of two series that are not present in both. Newer versions of REBOL also let you use DIFFERENCE to compute the difference between date/times.
Date differences produce a time in hours:
There is a limit to the time period that can be differenced between dates (determined by the internal size of the TIME datatype).
Note that performing this function over very large data sets can be CPU intensive.