Advanced Programming Guide

360 • Appendix A: Internal Representation and Manipulationnames are still available. The lexical-seq for a procedure contains entriesfor any surrounding-scope identifiers used by that procedure or by anyprocedures contained within it.Product, Quotient, PowerPROD ∧ expr ∧ expon ∧ expr ∧ expon . . . . . .Maple syntax: expr ^ expon * expr ^ expon ...Length: 2n + 1This structure is interpreted as pairs of factors and their numeric exponents.Rational or integer expressions to an integer power are expanded.If there is a rational constant in the product, this constant is moved to thefirst entry by the simplifier. A simple power, such as a^2, is represented asa PROD structure. More complex powers involving non-numeric exponentsare represented as POWER structures.RangeMaple syntax: expr .. exprLength: 3RationalMaple syntax: 1/2Length: 3RANGE ∧ expr ∧ exprRATIONAL ∧ integer ∧ pos − integerThis structure is one of the basic numeric objects in Maple. Note thatthis is not a division operation, but only a representation for rationalnumbers. Both fields must be integers (INTPOS, INTNEG or an immediateinteger) and the second must be positive.Read StatementMaple syntax: read exprLength: 2READ∧ exprThe Maple read statement. The expression must evaluate to either astring or symbol (STRING or NAME structure), and specifies the name ofthe file to read.