This is documentation for Mathematica 6, which was
based on an earlier version of the Wolfram Language.
View current documentation (Version 11.2)
Built-in Mathematica SymbolTutorials »


is an option for Trace and related functions which specifies whether symbols such as x should match symbols with local names of the form x$nnn.
  • The default setting is MatchLocalNames->True.
  • With the default setting, Trace[expr, x=rhs] will show assignments to local variables whose names are of the form x$nnn.
  • Trace[expr, x=rhs, MatchLocalNames->False] shows assignments only for the global symbol x.
New in 2