Type representing relations

Use only in the MuPAD Notebook Interface.

This functionality does not run in MATLAB.


testtype(obj, Type::Relation)


With Type::Relation, relational expression can be identified.

The call testtype(obj, Type::Relation) checks, whether obj is a relational expression and returns TRUE, if it is, otherwise FALSE.

A relation in MuPAD® is an expression of the type " _equal ", " _unequal ", " _less " and " _leequal ".

    Note:   Expressions with the operations >= and > will be interpreted as expressions with <= and < by exchanging the operands (see Example 2).

This type does not represent a property.


Example 1

x > 3 is a relation, while TRUE is not:

testtype(x > 3, Type::Relation),
testtype(TRUE, Type::Relation)

Example 2

MuPAD always interprets expressions with the operations >= and > as expressions with <= and < with the operands exchanged:

x > 3;
prog::exprtree(x > 3):

+-- 3
`-- x

The operator is not >, but <, and the operands have been swapped:

op(x > 3, 0..2)



Any MuPAD object

Return Values

See testtype

See Also

MuPAD Functions

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