how to if not

Hello the community !

how to make a condition if not ?

let me explain :)

I have tree sprites/objects on floor for example and I want to test if there is not an object tree at a certain location I want to create an object stone

this is probably easy but I am new to construct and all this coding language.

btw it's awesome what they ve done with C2, I just try the new fonction for tiling it's great, i ll use that for sure soon

Thx

To invert a condition right click and select invert.

Thanks !