Programmer's Guide & Language Reference - Dyalog Limited

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Chapter 1: Introduction 6Complex NumbersComplex numbers use the J notation introduced in IBM APL2 and are written as aJbor ajb (without spaces) where the real and imaginary parts a and b are written asdescribed above. The capital J is always used to display a value.Examples2+¯1*.52J1.3j.50.3J0.51.2E5J¯4E¯4120000J¯0.0004The empty vector (⍳0) may be represented by the numeric constant ⍬ called ZILDE.CharactersCharacters are entered within a pair of APL quotes. The surrounding APL quotes arenot displayed on output. The APL quote character itself must be entered as a pair ofAPL quotes.Examples'DYALOG APL'DYALOG APL'I DON''T KNOW'I DON'T KNOW*'*'
Chapter 1: Introduction 7Enclosed ElementsAn array may be enclosed to form a scalar element through any of the followingmeans:• by the enclose function (⊂)• by inclusion in vector notation• as the result of certain functions when applied to arraysExamples(⊂1 2 3),⊂'ABC'1 2 3 ABC(1 2 3) 'ABC'1 2 3 ABC⍳2 31 1 1 2 1 32 1 2 2 2 3
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Appendices: PCRE Specifications 717
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Symbolic Index 725Symbolic Index+ S
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Symbolic Index 727⎕AISee account
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Index 731IndexAabort function 221ab
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Index 733composition operatorform I
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Index 735else-if condition 74else q
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Index 737getting properties of GUI
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Index 739direction 242disclose 244e
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Index 743shape of arrays 4share-tyi
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Index 745warning label name present
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