[Octave-bug-tracker] [bug #55162] qfuncinv in communications pkg depends on statistics pkg

[Tony Richardson]

URL:
  <https://savannah.gnu.org/bugs/?55162>

                 Summary: qfuncinv in communications pkg depends on statistics
pkg
                 Project: GNU Octave
            Submitted by: amrichardson
            Submitted on: Tue 04 Dec 2018 04:31:01 PM UTC
                Category: Octave Forge Package
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Other
                  Status: None
             Assigned to: None
         Originator Name: Tony Richardson
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.4.1
        Operating System: Any

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Details:

Loading the communications package does not automatically load the statistics
package, but qfuncinv in the comm pkg requires norminv from the statistics
pkg.  Using qfuncinv after loading the comm pkg produces an error re an
undefined function unless the statistics package is also loaded.

I would recommend replacing the line:


y = -norminv(x)


with


y = sqrt(2)*erfcinv(2*x)


in qfuncinv.m to remove the dependency.  (erfcinv is built-in)  norminv
ultimately relies on erfcinv to produce a result anyway.




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