What is this mystery function?

[LarsUlrich]

I want to put one of these into a program I am writing but for the life of me I cannot remember what it is called (or where it is located in the panel).

I drew it from memory in MS Paint and how it is wired, though I cannot remember if it sends a boolean true/false or if it sends the value.

It stores a value in memory from the control it is wired to.  If the value doesn't change, it doesn't do anything (or sends a false constant).  If the value does change, it sends the new value (or a true constant).

On second thought I am pretty sure it sends boolean values, though I don't see it in the boolean tab.

[MarkDavid · Accepted solution]

If you're refering to the "arrow" it could be a feedback node..functions>programming>structures

[LarsUlrich]

haha I think that is it

[LarsUlrich]

So my memory wasn't quite right as to what it looked like, but that was it!  Thank you!

[X.]

Yeah, and it does not output a Boolean either...

[altenbach]

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@LarsUlrich wrote:

If the value doesn't change, it doesn't do anything (or sends a false constant).  If the value does change, it sends the new value (or a true constant).

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A feedback node does not do that alone. You need additional code, for example a "not equal". (there is also an openg tool)

Here's simple demo. (The LED will light up for one iteration whenever the numeric changes its value.)