• → ClearAll

Clear

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Clear[$symb_1$, $symb_2$, ...]

clears all values of the given symbols. The arguments can also be given as strings containing symbol names.

• • x = 2;

• • Clear[x]

• • x

• • x = 2;

• • y = 3;

• • Clear["Global`*"]

• • x

• • y

ClearAll may not be called for Protected symbols.

• • Clear[Sin]

The values and rules associated with built-in symbols will not get lost when applying Clear
(after unprotecting them):

• • Unprotect[Sin]

• • Clear[Sin]

• • Sin[Pi]

Clear does not remove attributes, messages, options, and default values associated with the symbols. Use ClearAll to do so.

• • Attributes[r] = {Flat, Orderless};

• • Clear["r"]

• • Attributes[r]