4 octave test failures with -optional=sage,external

[videlec]

sage -t --warn-long 73.4 src/doc/en/constructions/linear_algebra.rst
**********************************************************************
File "src/doc/en/constructions/linear_algebra.rst", line 460, in doc.en.constructions.linear_algebra
Failed example:
    octave.solve_linear_system(A,b)    # optional - octave
Expected:
    [-0.33333299999999999, 0.66666700000000001, 0]
Got:
    [-0.333333, 0.666667, 0]
**********************************************************************
1 item had failures:
   1 of 115 in doc.en.constructions.linear_algebra
    [93 tests, 1 failure, 4.46 s]
sage -t --warn-long 73.4 src/doc/en/developer/coding_in_other.rst
**********************************************************************
File "src/doc/en/developer/coding_in_other.rst", line 705, in doc.en.developer.coding_in_other.solve_linear_system
Failed example:
    octave.solve_linear_system(A,b)    # optional - octave
Expected:
    [-0.33333299999999999, 0.66666700000000001, -3.5236600000000002e-18]
Got:
    [-0.333333, 0.666667, 0]
**********************************************************************
1 item had failures:
   1 of   6 in doc.en.developer.coding_in_other.solve_linear_system
    [41 tests, 1 failure, 1.35 s]
sage -t --warn-long 73.4 src/sage/interfaces/octave.py
**********************************************************************
File "src/sage/interfaces/octave.py", line 218, in sage.interfaces.octave.Octave.set_seed
Failed example:
    [o.rand() for i in range(5)] # optional - octave
Expected:
    [ 0.134364,  0.847434,  0.763775,  0.255069,  0.495435]
Got:
    [0.134364, 0.847434, 0.763775, 0.255069, 0.495435]
**********************************************************************
File "src/sage/interfaces/octave.py", line 650, in sage.interfaces.octave.OctaveElement.__bool__
Failed example:
    bool(octave('[]'))                # optional - octave
Expected:
    False
Got:
    True
**********************************************************************
2 items had failures:
   1 of   4 in sage.interfaces.octave.Octave.set_seed
   1 of   8 in sage.interfaces.octave.OctaveElement.__bool__
    [133 tests, 2 failures, 3.13 s]

Component: interfaces

Author: Frédéric Chapoton

Branch/Commit: 31a5f1d

Reviewer: Sébastien Labbé

Issue created by migration from https://trac.sagemath.org/ticket/23768

[fchapoton]

Branch: u/chapoton/23768

[fchapoton]

comment:1

Tested and corrected with octave 4.0.0

I do not see the failures in src/sage/interfaces/octave.py.

---

New commits:

31a5f1d

fix some octave optional doctests

[fchapoton]

Author: Frédéric Chapoton

[fchapoton]

Commit: 31a5f1d

[seblabbe]

Reviewer: Sébastien Labbé

[vbraun]

Changed branch from u/chapoton/23768 to 31a5f1d