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MatchLocalNames

  • MatchLocalNames 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.
  • See the Mathematica book: Section 2.5.10.

    Further Examples

    This traces assignments to all variables with names of the form x$ nnn.

    In[1]:=

    Out[1]=

    This traces assignments only to the specific global variable x.

    In[2]:=

    Out[2]=