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Type::ListOf

Type representing lists of objects with the same type

Use only in the MuPAD Notebook Interface.

This functionality does not run in MATLAB.

Syntax

testtype(obj, (obj_type, <min_nr, <max_nr>>))

Description

Type::ListOf describes lists of objects of a specified type.

The call testtype(obj, Type::ListOf(obj_types, ...)) checks, whether obj is a list with elements of the given type obj_type, ... and returns TRUE, if it holds, otherwise FALSE.

The two optional parameters min_nr and max_nr determine the minimum and maximum number of elements in the analyzed list. If the numbers are not be given, the number of elements in the list will not be checked. If only the minimum is given, only the minimal number of elements in the list is checked.

Note especially that Type::Union provides a way to allow more than one type for the list elements.

This type does not represent a property.

Examples

Example 1

Is the given list a list of identifiers?

testtype([a, b, c, d, e, f], Type::ListOf(DOM_IDENT))

Is the given list a list of at least five real numbers?

testtype([0, 0.5, 1, 1.5, 2, 2.5, 3], Type::ListOf(Type::Real, 5))

Example 2

testtype is used to select lists with exactly two identifiers:

S := {[a], [a, b], [d, 1], [0, d], [e], [d, e]}:
select(S, testtype, Type::ListOf(DOM_IDENT, 2, 2))

Parameters

obj

Any MuPAD® object

obj_type

The type of the objects; a type can be an object of the library Type or one of the possible return values of domtype and type

min_nr

The minimal number of objects as nonnegative integer

max_nr

The maximal number of objects as nonnegative integer

Return Values

See testtype

See Also

MuPAD Domains

MuPAD Functions

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