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::
Tally  Tally
Tally  Tally  difference of tallies
Synopsis
Usage:
x  y
Operator:

Inputs:
x
,
a
tally
y
,
a
tally
Outputs:
a
tally
, the difference of the two tallies
Description
The count associated to an item
i
in the result is the difference of the counts in
x
and in
y
if it's positive, otherwise, zero.
i1 : tally {a,a,b,c}  tally {c,d,d} o1 = Tally{a => 2} b => 1 o1 : Tally
See also
Tally
 the class of all tally results