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Home/ Questions/Q 6636881
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Editorial Team
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Editorial Team
Asked: May 25, 20262026-05-25T23:14:32+00:00 2026-05-25T23:14:32+00:00

I would like to step through, using debug() or trace() , a function that

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I would like to step through, using debug() or trace(), a function that was not exported. For example, how can I do it for vcov.polr of the package MASS, which is called from the function polr. polr is exported, but vcov.polr is not.

That is, when I run polr, I would like the debug browser to start once the code enters vcov.polr.

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  1. Editorial Team
    Editorial Team
    2026-05-25T23:14:33+00:00Added an answer on May 25, 2026 at 11:14 pm

    try

    debug(MASS:::vcov.polr)
    

    note that three colon ::: make the hidden object in a package visible.

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