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BUILT-IN MATHEMATICA SYMBOL
Attributes
Attributes[symbol]
gives the list of attributes for a symbol.
Details
- The attributes of a symbol can be set by assigning a value to Attributes[s]. If a single attribute is assigned, it need not be in a list.
- Attributes[s]={} clears all attributes of a symbol.
- Attributes[{s1, s2, ...}] gives a list of the attributes for each of the
. - Attributes["string"] gives the attributes for Symbol["string"].
- Attributes[HoldPattern[s]] is treated as equivalent to Attributes[s].
- Attributes for functions must be set before any definitions that involve the functions are given.
- The complete list of possible attributes for a symbol f is:
-
Constant all derivatives of f are zero Flat f is associative HoldAll all the arguments of f are not evaluated HoldAllComplete the arguments of f are completely shielded from evaluation HoldFirst the first argument of f is not evaluated HoldRest all but the first argument of f are not evaluated Listable f is automatically "threaded" over lists Locked attributes of f cannot be changed NHoldAll the arguments of f are not affected by N NHoldFirst the first argument of f is not affected by N NHoldRest all but the first argument of f are not affected by N NumericFunction the value of f is assumed to be a number when its arguments are numbers OneIdentity 
, 
, etc. are equivalent to a in pattern matching Orderless f is commutative Protected values of f cannot be changed ReadProtected values of f cannot be read SequenceHold Sequence objects in the arguments of f are not flattened out Stub Needs is automatically called if the symbol is ever input Temporary f is a local variable, removed when no longer used
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