Type of an object

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type(object) returns the type of the object.

If object is not an expression of domain type DOM_EXPR, then type(object) is equivalent to domtype(object), i.e., type returns the domain type of the object.

If object is an expression of domain type DOM_EXPR, then its type is determined by its 0-th operand (the “operator”). If the operator has a "type" slot, then type returns this value, which usually is a string. If the operator has no "type" slot, then type returns the string "function".

In contrast to most other functions, type does not flatten arguments that are expression sequences. Cf. Example 4.


Example 1

If an object is not an expression, its type equals its domain type:


Example 2

The operator of a sum is _plus; the type slot of that operator is "_plus":

type(x + y*z)

type evaluates its argument: thereby, the difference of x and y becomes the sum of x and (-1)*y. Its type is not "_subtract", but "_plus":

type(x - y)

Example 3

If the operator of an expression is not a function environment having a type slot, the expression is of type "function":


Example 4

The following call to type is not regarded as a call with two arguments, because expression sequences in the argument are not flattened:

type((2, 3))



Any MuPAD® object

Return Values

Domain type of type DOM_DOMAIN or a character string.

Overloaded By


See Also

MuPAD Functions