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.

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