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Type representing lists of objects with the same type

MuPAD® notebooks are not recommended. Use MATLAB® live scripts instead.

MATLAB live scripts support most MuPAD functionality, though there are some differences. For more information, see Convert MuPAD Notebooks to MATLAB Live Scripts.


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


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.


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))



Any MuPAD® object


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


The minimal number of objects as nonnegative integer


The maximal number of objects as nonnegative integer

Return Values

See testtype

See Also

MuPAD Domains

MuPAD Functions

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