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Clear Definitions for Symbols and Functions—Wolfram Language Documentation

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Clear Definitions for Symbols and Functions

Clearing definitions works the same for symbols assigned values with Set (=) and functions defined with SetDelayed (:=).

Define a function or symbol

Define a function f:

Find the definition of a function or symbol

Find the definition of f:

You can also use Definition to get a symbol or a function’s definition.

Clear the definition of a function or symbol

Clear the definition of f:

The function f is no longer defined:

Notes If you redefine a function, using Clear beforehand will ensure that no unwanted definitions linger and cause potential problems. Clear clears definitions, but not attributes, messages or defaults associated with symbols. Use ClearAll to clear all information associated with a symbol. Clear and ClearAll leave the cleared symbol intact. Use Remove to remove the symbol completely: The symbol x persists after Clear: Remove the symbol completely:

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