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The not( Command

Command Summary Command Syntax Calculator Compatibility Token Size
Flips the truth value of its argument. not(value) TI-83/84/+/SE 1 byte

Press:
1. 2nd TEST to access the test menu.
2. RIGHT to access the LOGIC submenu.
3. 4 to select not(, or use arrows and ENTER.

The not( Command

The last logical operator available on the 83 series takes only one value as input. not( comes with its own parentheses to make up for this loss. Quite simply, it negates the input: False becomes True (1) and True returns False (0). not( can be nested; one use is to make any True value into a 1.

:not(0)
           1

:not(-20 and 14)

           0

:not(not(2))
           1

Advanced Uses

not(not(X)) will make any value X into 1 if it's not 0, and will keep it 0 if it is.

Optimization

not(X) and X=0 have the same truth value, but not( is shorter if the closing parenthesis is omitted:

:If A=0
can be
:If not(A
Authors: KG