A *Y-VAR* represents a one independent variable mathematical function. The independent depends on the mode the Y-Var is associated with. Func mode Y[0-9] use X, Polar Y-Vars r[1-6] use θ, Param mode T[X,Y][1-6] use T and Seq mode u,v and w use n.

Y-VARs are stored as strings, but return a Real. For example `"1+1"→Y1`

is a legal statement, `Y1→A`

is a legal statement, be neither `5→Y1`

nor `Y1→Str1`

is allowed.

Additionally to just using the variable, one can use a construction like `Y1(4)`

to get the value of the expression when the independent variable for that mode is the value in parenthesis.

! *This article is a stub. Please help the TI-BASIC Wiki by expanding it*