I have found an example for clearing all symbol definition by:
ClearAll["Global`*"]
But what does the symbol ` mean? It isn't the apostrophe ', yet it is not documented in Mathematica help.
Jim
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1 Answer
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In Mathematica, the back-tick or grave accent ( ` ) is used for two purposes:
As a context mark to delimit contexts (name spaces) in the full name of a variable.
As a number mark to mark the end of an approximate number, and separate the number from its precision value.
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$\begingroup$ and what does that
*symbol mean? I see in the documentation that it is used just in the Generalization & Extensions part. But I couldn't find the documentation about it? $\endgroup$ Sep 20, 2015 at 21:10 -
1$\begingroup$ I'm guessing your are asking about the * in
ClearAll["Global`*"]. That * means zero-or-more-characters. It is documented here under Abbreviated String Patterns. BTW, posting your question as a comment to my answer is most inappropriate. It has nothing to do with my answer and nothing to do with the original question. In the future, please keep your posts on-topic. $\endgroup$ Sep 21, 2015 at 4:15 -
$\begingroup$ ok, I thought it will be a duplicate if I post a new one! $\endgroup$ Sep 21, 2015 at 4:41
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$\begingroup$ @m_goldberg though to be fair, the question was about what ` means in the command
ClearAll["Global`*"], and your answer mentioned the meanings of ` in general but did not discuss its use in this context. $\endgroup$– WillGNov 14, 2019 at 18:56
Contextin Mathematica, see this. $\endgroup$Context, see this: Meaning of backtick in floating-point literal $\endgroup$