I know that it exist manual entries about expressions but i haven't been able to understand them well enough to get the hang of expressions. I have made successfull expressions but some doesn't work. I made one today that doesn't work. Expressions seem to always need " " in them. Is that rigth? Do they need ( ) too? How do you write a expressions in easy to understand words. Do you write it "( Sprite )" or "Sprite"()? I may go deeper into what my expression that doesn't work is but i just explain that if i need to.
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They basically express certain things in a quantitative form.
It depends on what you want to do.
Anything inside " " is just text.
That is is just an expression for text with a value of Sprite.
Parenthesis () have two purposes. The first is just like in math to control what operations are done first.
Ex: 1+2*3 = 7
Ex: (1+2)*3 = 9
The second purpose is for expressions that take parameters.
Ex: min(1, 3, 2)
Beyond that it should be pretty simple. But feel free to post the equation you made that doesn't work and describe what you want it to do.