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Unset::norep TagUnset::norep

Unset::norep TagUnset::norep

更多信息

  • This message is generated when there are no definitions associated with the indicated pattern.
  • The notation pattern=. can be used for Unset[pattern].
  • Off[message] switches off the message; On[message] switches it on. For example: Off[Unset::norep].

范例

基本范例  (1)

An error occurs unless there is an evaluation rule for the argument in Unset:

Wolfram Language code: Unset[testsym[p_]]

This shows a valid use of Unset:

Wolfram Language code: testsym[p_] := Cos[p]
Wolfram Language code: testsym[1]
Wolfram Language code: testsym[p_]=.
Wolfram Language code: testsym[1]