Programmer's Guide & Language Reference - Dyalog Limited

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Chapter 1: Introduction 20Function Assignment & DisplayThe result of a function-expression may be given a name. This is known as FUNC-TION ASSIGNMENT (see also "Dynamic Functions & Operators" on page 112). Ifthe result of a function-expression is not given a name, its value is displayed. This istermed FUNCTION DISPLAY.Examples++/PLUS←+PLUSSUM←+/SUMFunction expressions may include defined functions and operators. These are displayedas a ∇ followed by their name.Example∇ R←MEAN X[1] R←(+/X)÷⍴X∇⍝ Arithmetic meanMEAN∇MEANAVERAGE←MEANAVERAGE∇MEANAVG←MEAN∘,AVG∇MEAN ∘,
OperatorsChapter 1: Introduction 21An operator is an operation on one or two operands which produces a function calleda DERIVED FUNCTION. An operand may be a function or an array. Operators arenot ambivalent. They require either one or two operands as applicable to the particularoperator. However, the derived function may be ambivalent. The derivedfunction need not return a result. Operators have higher precedence than functions.Operators have long scope on the left. That is, the left operand is the longest functionor array expression on its left. The left operand may be terminated by:1. the end of the expression2. the right-most of two consecutive functions3. a function with an array to its left4. an array with a function to its leftan array or function to the right of a monadic operator.A dyadic operator has short scope on the right. That is, the right operand of an operatoris the single function or array on its right. Right scope may be extended byenclosing an expression in parentheses.Examples⍴¨X←'WILLIAM' 'MARY' 'BELLE'7 4 5⍴∘⍴¨X1 1 1(⍴∘⍴)¨X1 1 1⎕∘←∘⎕VR¨'PLUS' 'MINUS'∇ R←A PLUS B[1] R←A+B∇∇ R←A MINUS B[1] R←A-B∇10PLUS/1 2 3 4
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Symbolic Index 725Symbolic Index+ S
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Index 731IndexAabort function 221ab
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Index 739direction 242disclose 244e
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