Programmer's Guide & Language Reference - Dyalog Limited

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Chapter 1: Introduction 101 2 ←→ (1)(2) ←→ 1 (2) ←→ (1) 22'X'3 ←→ 2 'X' 3 ←→ (2) ('X') (3)1 (2+2) ←→ (1) ((2+2)) ←→ ((1)) (2+2)Vector notation may be used to define an item in vector notation:⍴X ← 1 (2 3 4) ('THIS' 'AND' 'THAT')3X[2]2 3 4X[3]THIS AND THATExpressions within parentheses are evaluated to produce an item in the vector:Y ← (2+2) 'IS' 4Y4 IS 4The following identity holds:Structuring of ArraysA B C ←→ (⊂A), (⊂B), ⊂CA class of primitive functions re-structures arrays in some way. Arrays may be inputonly in scalar or vector form. Structural functions may produce arrays with a higherrank. The Structural functions are reshape (⍴), ravel, laminate and catenate (,), reversaland rotation (⌽), transpose (⍉), mix and take (↑), split and drop (↓), and enclose(⊂). These functions are described in Chapter 4.Examples1 23 42 2⍴1 2 3 4ABCDEFGH2 2 4⍴'ABCDEFGHIJKLMNOP'IJKLMNOP↓2 4⍴'COWSHENS'COWS HENS
Display of ArraysChapter 1: Introduction 11Simple scalars and vectors are displayed in a single line beginning at the left margin.A number is separated from the next adjacent element by a single space. The numberof significant digits to be printed is determined by the system variable ⎕PP whosedefault value is 10. The fractional part of the number will be rounded in the last digitif it cannot be represented within the print precision. Trailing zeros after a decimalpoint and leading zeros will not be printed. An integer number will display withouta decimal point.Examples0.1 1.0 1.120.1 1 1.12'A' 2 'B' 'C'A 2 BC÷3 2 60.3333333333 0.5 0.1666666667If a number cannot be fully represented in ⎕PP significant digits, or if the numberrequires more than five leading zeros after the decimal point, the number is representedin scaled form. The mantissa will display up to ⎕PP significant digits, buttrailing zeros will not be displayed.Examples⎕PP←3123 1234 12345 0.12345 0.00012345 0.00000012345123 1.23E3 1.23E4 0.123 0.000123 1.23E¯7Simple matrices are displayed in rectangular form, with one line per matrix row. Allelements in a given column are displayed in the same format, but the format andwidth for each column is determined independently of other columns. A column istreated as numeric if it contains any numeric elements. The width of a numeric columnis determined such that the decimal points (if any) are aligned; that the E charactersfor scaled formats are aligned, with trailing zeros added to the mantissae ifnecessary, and that integer forms are right-adjusted one place to the left of the decimalpoint column (if any). Numeric columns are right-justified; a column which containsno numeric elements is left-justified. Numeric columns are separated from theirneighbours by a single column of blanks.
Page 1 and 2: The tool of thought for expert prog
Page 3 and 4: 3ContentsChapter 1: Introduction 1W
Page 5 and 6: And, Lowest Common Multiple: 223Ass
Page 7 and 8: 7Take with Axes: 317Times: 318Trans
Page 9 and 10: File Check and Repair: 431File Copy
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Page 13 and 14: KEY CODE TYPE ERROR 694FORMAT FILE
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Operators (A-Z)Chapter 5: Primitive
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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 741partition function 298part
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Index 745warning label name present
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