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f/:lhs=.

removes any rules defined for lhs, associated with the symbol f.

Details
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Examples  
Basic Examples  
Scope  
Properties & Relations  
Possible Issues  
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TagUnset

f/:lhs=.

removes any rules defined for lhs, associated with the symbol f.

Details

  • Rules are removed only when their left‐hand side is identical to lhs, and the tests in Condition given on the right‐hand side are also identical.

Examples

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Basic Examples  (1)

Scope  (2)

Clear immediate definitions:

Clear delayed definitions:

Properties & Relations  (1)

Use =. to clear definitions with a particular left-hand side:

Clear all definitions:

Possible Issues  (1)

To clear an upvalue, the tag is required:

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

Text

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

CMS

Wolfram Language. 1988. "TagUnset." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/TagUnset.html.

APA

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

BibTeX

@misc{reference.wolfram_2025_tagunset, author="Wolfram Research", title="{TagUnset}", year="1988", howpublished="\url{https://reference.wolfram.com/language/ref/TagUnset.html}", note=[Accessed: 08-August-2025]}

BibLaTeX

@online{reference.wolfram_2025_tagunset, organization={Wolfram Research}, title={TagUnset}, year={1988}, url={https://reference.wolfram.com/language/ref/TagUnset.html}, note=[Accessed: 08-August-2025]}