[Octave-bug-tracker] [bug #55501] subsequent calls to "help @sym/beta" gives "help beta" text

[Colin Macdonald]

URL:
  <https://savannah.gnu.org/bugs/?55501>

                 Summary: subsequent calls to "help @sym/beta" gives "help
beta" text
                 Project: GNU Octave
            Submitted by: cbm
            Submitted on: Thu 17 Jan 2019 06:08:22 PM UTC
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Regression
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 5.0.1
        Operating System: GNU/Linux

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Details:

If I load the symbolic package in the latest 5.0.1 (well within a day or two),
"help" sometimes fails.

1.  "help @sym/beta".  This works.

2.  "help @sym/beta".  Now it gives the result of the core "help beta".

All subsequent calls to "help @sym/beta" give the core beta function.

100% reproducible for me.  "clear classes" resets the behaviour so that "help
@sym/beta" works once correctly again.

Notably I cannot reproduce with "help @sym/sin": perhaps because of built-in
versus m-file (but that's just a guess).


>> help beta
'beta' is a function from the file
/home/cbm/.octavehg/share/octave/5.0.1/m/specfun/beta.m

>> help sin
'sin' is a built-in function from the file libinterp/corefcn/mappers.cc



Here's another overloaded function, with slightly different but related
results:

>> clear classes
>> help @sym/qr
'@sym/qr' is a function from the file
/home/cbm/work/octsympy/octsympy.git/inst/@sym/qr.m

 -- Method on @sym: [Q, R] = qr (A)
 -- Method on @sym: [Q, R] = qr (A, 0)
     Symbolic QR factorization of a matrix.

    ---- 8< ----

    without the extra argument.

    See also: qr, @sym/lu.

>> help @sym/qr
error: help: '@sym/qr' not found

>> help qr
'qr' is a function from the file
/home/cbm/.octavehg/lib/octave/5.0.1/oct/x86_64-pc-linux-gnu/qr.oct

 -- [Q, R] = qr (A)

    ----- 8< -----



So maybe different behaviours depending on whether the core function is a .oct
file, .cc file or .m file.




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