[Octave-bug-tracker] [bug #56936] format short displays 6, rather than 5, significant digits as documented

[Rik]

URL:
  <https://savannah.gnu.org/bugs/?56936>

                 Summary: format short displays 6, rather than 5, significant
digits as documented 
                 Project: GNU Octave
            Submitted by: rik5
            Submitted on: Mon 23 Sep 2019 11:02:05 AM PDT
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Matlab Compatibility
                  Status: Confirmed
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Any

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Details:

According to the documentation, "format short" (default), should display 5
significant figures.  It does so for scalars, but not for matrices.


octave:16> format short
octave:17> x = pi
x =  3.1416
octave:18> x = [-pi;0;pi]
x =

  -3.14159
         0
   3.14159

octave:19> diary off


For comparison, Matlab displays "3.1416" in both cases. 

This is probably a bug in pr-output.cc in the routines
make_real_matrix_format, make_complex_matrix_format,
make_complex_scalar_format).  It looks like the number of figures to the right
of the decimal point is being set at the precision.






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