# - VirtualTally -- negation of a VirtualTally

• Operator: -

## Description

-x -- the negation of x

 i1 : x = tally {a,b,b,c,c,d,d,d} o1 = Tally{a => 1} b => 2 c => 2 d => 3 o1 : Tally i2 : x' = new VirtualTally from x o2 = VirtualTally{a => 1} b => 2 c => 2 d => 3 o2 : VirtualTally i3 : - x' o3 = VirtualTally{a => -1} b => -2 c => -2 d => -3 o3 : VirtualTally