type -- the type of an object
Introductiontype(object) returns the type of the
object.
Call(s)type(object)
Parametersobject |
- | any MuPAD object |
Returnsa domain type of type DOM_DOMAIN or a character
string.
object
Related
Functionscoerce, domtype, hastype, testtype, Type
Detailsobject 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.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".type does not flatten arguments that are expression sequences. Cf. example 4.type is a function of the system kernel.
Example
1If an object is not an expression, its type equals its domain type:
>> type(3)
DOM_INT
Example
2The operator of a sum is _plus; the type slot of that operator
is "_plus":
>> type(x + y*z)
"_plus"
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)
"_plus"
Example
3If the operator of an expression is not a function
environment having a type slot, the expression is of type
"function":
>> type(f(2))
"function"
Example
4The 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))
"_exprseq"