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Variable types

A variable type is a borned set of values allowed to a one dimensional variable. Variable types can be either discrete or continuous. Particularly, four types of variables can be defined with ProBT: (i) integers, (ii) sparse sequences, (iii) discrete reals and (iv) continuous reals. Internally, the value of a variable of type integer is stored in a plInteger; the other types (ii, iii, and iv) are stored in a plFloat. plInteger and plFloat are native types of ProBT and the internal functionalities of it are based in these two types.