Suppose MyApp`Func1 is a function inside the package MyApp. How do I prevent Trace[Func1[x]] from displaying everything inside Func1 (or what's inside any MyApp functions)?

SetAttributes[MyApp`Func1, {ReadProtected, Locked}] appears to do the job. but then I can't modify options of Func1 with SetOptions.

  • $\begingroup$ What do want Trace[Func1[x]] to display if not the functions that are called inside it? After all, that's what Trace is for. $\endgroup$
    – m_goldberg
    Jul 23, 2017 at 6:00
  • $\begingroup$ Why can't you? Unless you set it Protected there should be no problem. $\endgroup$
    – Kuba
    Jul 23, 2017 at 6:12
  • $\begingroup$ It sounds like you know the solution: use a different public Symbol for the Options, and pass those to the Locked function that you don't want read. $\endgroup$
    – Mr.Wizard
    Jul 23, 2017 at 6:59

1 Answer 1


Just use the TraceOff option:

Func1[x_] := 2+2
Trace[Func1[x], TraceOff->_Func1]


If you want to kill off tracing of a whole package, you could use something like:

Trace[expr, TraceOff -> (h_[___] /; Context[h]==="MyApp`")]
  • $\begingroup$ That is very helpful. Do you know how to use the related $TraceOff symbol? I tried setting it to the pattern you suggested, but it didn't work for me. $\endgroup$
    – QuantumDot
    Jul 23, 2017 at 20:39
  • $\begingroup$ Doing $TraceOff=patt; Trace[expr] will not work because Trace sets $TraceOff to None (the default value of TraceOff). $\endgroup$
    – Carl Woll
    Jul 23, 2017 at 22:34

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