Clear::ssym ClearAll::ssym Information::ssym

更多信息

  • This message is generated when the indicated expression is expected to be a symbol or a string.
  • The arguments in Clear, ClearAll, and Information are expected to be symbols or strings containing the names of symbols.
  • Subscripted expressions are normal expressions rather than symbols.
  • You can use Unset to clear specific rules associated with a symbol.
  • Off[message] switches off the message; On[message] switches it on. For example: Off[Clear::ssym].

范例

基本范例  (1)

An error occurs because the argument is a normal expression rather than a symbol: