Programmer's Guide & Language Reference - Dyalog Limited

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Chapter 1: Introduction 16In the last example, two distinct instances are constructed (the first by ⎕NEW and thesecond by the overtake).Fill items are used in a number of operations including:• First (⊃ or ↑) of an empty array• Fill-elements for overtake• For use with the Each operator on an empty array
ExpressionsChapter 1: Introduction 17An expression is a sequence of one or more syntactic tokens which may be symbolsor constants or names representing arrays (variables) or functions. An expressionwhich produces an array is called an ARRAY EXPRESSION. An expression whichproduces a function is called a FUNCTION EXPRESSION. Some expressions do notproduce a result.An expression may be enclosed within parentheses.Evaluation of an expression proceeds from right to left, unless modified byparentheses. If an entire expression results in an array that is not assigned to a name,then that array value is displayed. (Some system functions and defined functionsreturn an array result only if the result is assigned to a name or if the result is the argumentof a function or operator.)Examples45X←2×3-12×3-1(2×3)-1Either blanks or parentheses are required to separate constants, the names of variables,and the names of defined functions which are adjacent. Excessive blanks orsets of parentheses are redundant, but permitted. If F is a function, then:F 2←→ F(2) ←→ (F)2 ←→ (F) (2) ←→ F (2) ←→ F ((2))Blanks or parentheses are not needed to separate primitive functions from names orconstants, but they are permitted:-2 ←→ (-)(2) ←→ (-) 2Blanks or parentheses are not needed to separate operators from primitive functions,names or constants. They are permitted with the single exception that a dyadic operatormust have its right argument available when encountered. The following syntacticalforms are accepted:(+.×) ←→ (+).× ←→ +.(×)The use of parentheses in the following examples is not accepted:+(.)× or (+.)×
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Appendices: PCRE Specifications 717
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Symbolic Index 725Symbolic Index+ S
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Index 731IndexAabort function 221ab
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Index 737getting properties of GUI
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Index 745warning label name present
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