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Attributes

Attributes[symbol]
gives the list of attributes for a symbol.
  • 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 si.
  • Attributes["str"] gives a list of the attributes for all symbols which match the string pattern str.
  • 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:
Constantall derivatives of f are zero
Flatf is associative
HoldAllall the arguments of f are not evaluated
HoldAllCompletethe arguments of f are completely shielded from evaluation
HoldFirstthe first argument of f is not evaluated
HoldRestall but the first argument of f are not evaluated
Listablef is automatically "threaded" over lists
Lockedattributes of f cannot be changed
NHoldAllthe arguments of f are not affected by N
NHoldFirstthe first argument of f is not affected by N
NHoldRestall but the first argument of f are not affected by N
NumericFunctionthe value of f is assumed to be a number when its arguments are numbers
OneIdentityf[a], f[f[a]], etc. are equivalent to a in pattern matching
Orderlessf is commutative
Protectedvalues of f cannot be changed
ReadProtectedvalues of f cannot be read
SequenceHoldSequence objects in the arguments of f are not flattened out
StubNeeds is automatically called if the symbol is ever input
Temporaryf is a local variable, removed when no longer used
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