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function Calc
(const Expr: String): Variant
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returns the value of “Expr”, which is an expression
for example, Report.Calc('1+2') returns “3”
any valid fastReport expression can be passed
in the parameter
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function GetDataSet
(const Alias: String): TfrxDataSet
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returns the dataset having the specified name
the dataset must appear in the report's dataset list
(“Report>Data...” dialogue)
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