ArrayPack

Pack an array into an array of rank one.

Declaration

Syntax

 ArrayPack(expr array, expr mask, expr? vector, ttype type, expr? value)

Arguments

Argument Name	Argument Description
array	expression array
mask	array mask
vector	vector expression
type	table entry type
value	expression value

Return values

The return value is the expression that the ArrayPack represents.

Описание

ArrayPack stores the elements of array in an array or rank one. The beginning of the resulting array is made up of elements whose MASK equals TRUE. Afterwards, positions are filled with elements taken from VECTOR.

The result is an array of rank one and the same type as that of ARRAY. If VECTOR is present, the result size is that of VECTOR, the number of TRUE values in MASK otherwise.

Types

Only accepts integers.

Examples

integer :: m(6), p(2)
m = [ 1, 0, 0, 0, 5, 0 ]
p = pack(m, m /= 0)

ASR:

(TranslationUnit
    (SymbolTable
        1
        {
            m:
                (Variable
                    1
                    m
                    Local
                    ()
                    ()
                    Default
                    (Integer 4 [((IntegerConstant 1 (Integer 4 []))
                    (IntegerConstant 6 (Integer 4 [])))])
                    Source
                    Public
                    Required
                    .false.
                ),
            p:
                (Variable
                    1
                    p
                    Local
                    ()
                    ()
                    Default
                    (Integer 4 [((IntegerConstant 1 (Integer 4 []))
                    (IntegerConstant 2 (Integer 4 [])))])
                    Source
                    Public
                    Required
                    .false.
                )

        })
    [(=
        (Var 1 m)
        (ArrayConstant
            [(IntegerConstant 1 (Integer 4 []))
            (IntegerConstant 0 (Integer 4 []))
            (IntegerConstant 0 (Integer 4 []))
            (IntegerConstant 0 (Integer 4 []))
            (IntegerConstant 5 (Integer 4 []))
            (IntegerConstant 0 (Integer 4 []))]
            (Integer 4 [((IntegerConstant 1 (Integer 4 []))
            (IntegerConstant 6 (Integer 4 [])))])
        )
        ()
    )
    (=
        (Var 1 p)
        (ArrayPack
            (Var 1 m)
            (IntegerCompare
                (Var 1 m)
                NotEq
                (IntegerConstant 0 (Integer 4 []))
                (Logical 4 [])
                ()
            )
            ()
            (Integer 4 [((IntegerConstant 1 (Integer 4 []))
            (ArraySize
                (IntegerCompare
                    (Var 1 m)
                    NotEq
                    (IntegerConstant 0 (Integer 4 []))
                    (Logical 4 [])
                    ()
                )
                ()
                (Integer 4 [])
                ()
            ))])
            ()
        )
        ()
    )]
)

See Also