# Attributes

Attributes[symbol]

gives the list of attributes for a symbol.

Attributes["symbol"]

gives the attributes for the symbol named "symbol" if it exists.

Attributes[{s1,s2,}]

gives a list of the attributes for each of the si.

# 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 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 f[a], f[f[a]], 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
• Attributes has attributes Listable and HoldAll.

# Examples

open allclose all

## Basic Examples(2)

Attributes for an existing symbol:

Set attributes for a new symbol:

## Scope(1)

Attributes of a symbol:

Attributes of several symbols in a list:

The symbol can be given as a string:

## Properties & Relations(4)

Add a single attribute to the symbols f and g:

An assignment to Attributes is associated with f, not with Attributes:

Protecting a symbol is equivalent to setting the Protected attribute:

Attributes has the attribute HoldAll:

This gives the attributes of the symbol syms itself:

This gives the attributes of all symbols in the list syms:

Wolfram Research (1988), Attributes, Wolfram Language function, https://reference.wolfram.com/language/ref/Attributes.html (updated 1996).

#### Text

Wolfram Research (1988), Attributes, Wolfram Language function, https://reference.wolfram.com/language/ref/Attributes.html (updated 1996).

#### CMS

Wolfram Language. 1988. "Attributes." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 1996. https://reference.wolfram.com/language/ref/Attributes.html.

#### APA

Wolfram Language. (1988). Attributes. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/Attributes.html

#### BibTeX

@misc{reference.wolfram_2024_attributes, author="Wolfram Research", title="{Attributes}", year="1996", howpublished="\url{https://reference.wolfram.com/language/ref/Attributes.html}", note=[Accessed: 07-September-2024 ]}

#### BibLaTeX

@online{reference.wolfram_2024_attributes, organization={Wolfram Research}, title={Attributes}, year={1996}, url={https://reference.wolfram.com/language/ref/Attributes.html}, note=[Accessed: 07-September-2024 ]}