tilde operator is often used to denote a statistical model, where the thing on the left of the
~ is the response and the things on the right of the
~ are the explanatory variables.
here is an example
fo <- y ~ x1*x2
this line of code from this post
coordinates(meuse) = ~x+y
let's leave coordinates alone temporally.
in the case of
x = 1 y = 2
(or another more reasonable concrete example)
what is the detailed procedure of ~x+y operation?