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thinkScript exclamation mark (!) not operator in ThinkOrSwim

A "not operator" is essentially saying "not this" or "opposite of this"

The exclamation mark (!) in thinkScript code is used as a logical NOT operator. It helps you negate or reverse the condition it's applied to.


def condition = close < open ;
plot Data = !condition ;
The above statement says plot an up arrow whenever the condition is not true.

There are many many ways to code the above statement.
Another example would be:
def condition = close < open ;
plot Data = condition != 1 ;
definitions are either true or false which in boolean code is 1 or 0
So the above statement says plot an up arrow whenever the condition is not true.

A more complex example

plot Data = ! ((close > open) and close > average(close,9)) ;
The above statement says plot a down arrow when close is NOT > open and close is NOT > sma9

Other Common Examples
mathematical expressions vomit when there is missing data; so it is common in coding to test if the data field has a valid numeric expression.
Read more about isNaN:

!condition[1] and condition
used when you want to find the first bar where the condition turned true. This statement says when the condition was !not true on the previous bar[1] and is true on the current bar.

So, remember, when you want to reverse the logic of a condition in ThinkScript, simply place the "not" operator (!) in front of it to achieve your desired outcome.
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