[Octave-bug-tracker] [bug #56938] Regression in "format long" display between version 4.2 and 4.4

[Rik]

URL:
  <https://savannah.gnu.org/bugs/?56938>

                 Summary: Regression in "format long" display between version
4.2 and 4.4
                 Project: GNU Octave
            Submitted by: rik5
            Submitted on: Mon 23 Sep 2019 11:26:22 AM PDT
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Regression
                  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:

When "format long" is used to display matrices the base format is an
exponential even if the value to display does not require it.

Sample Octave session showing the difference between scalars and matrices.


octave:10> format long
octave:11>  x = pi
x =  3.141592653589793
octave:12> x = [-pi; 0; pi]
x =

  -3.141592653589793e+00
                       0
   3.141592653589793e+00


For reference, Matlab displays "3.141592653589793" for both.

Also related, if fixed_point_format is set to true then exponential format is
turned off, but there is one too many significant figures printed.



octave:18> fixed_point_format (1);
octave:19> x
x =

  -3.1415926535897931
                    0
   3.1415926535897931







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