Structures and Memory

Structures

Array

The fundamental structure in J is the array, everything is expressed as a subclass of an array. The structure of the array is as follows:

Type	Name
Integer	Type
Integer	Reference Count
Integer	Number of Elements
Integer	Rank
Integer Array	Shape
Pointer to Array Data	Value

In C this would be:

typedef struct {
    int type;
    int count;
    int num;
    int rank;
    int *shape;
    void *value;
} *A

An array can have one of several primitive types:

Category	Class	Type
Noun	Numeric	Bool
				Integer
				Float
				Complex
				Boxed
				Extended Integer
				Rational
		Literal	Char
		Symbol	Symbol
Function		Verb
			Adverb
			Conjunction