thanks for your question!
Yes, using formulas is not yet documented. I just didn't have the time yet :-/
But it's not really difficult, and it works very similar to Excel:
A formula starts with an
= and then contains a mathematical expression, in which you can also reference values from other cells, by using their cell name. Here are two basic examples:
will sum the cells A1 and B3.
will calculate the average value of the cells from C3 through C10.
Other math functions that can be used are
sin, sinh, arcsin, asin, arcsinh, asinh, cos, cosh, arccos, acos, arccosh, acosh, tan, tanh, arctan, atan, arctanh, atanh, sqrt, abs, ln, log, exp, floor, ceil, average, max, min, mod, pi, power, round, sum, rand_int, rand_float
Does that help?
P.S.: And thanks for your donation, I really appreciate it!