[Octave-bug-tracker] [bug #59299] Incorrect call to randi() in crossoverscattered() in GA package

[anonymous]

URL:
  <https://savannah.gnu.org/bugs/?59299>

                 Summary: Incorrect call to randi() in crossoverscattered() in
GA package
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Mon 19 Oct 2020 07:55:49 AM UTC
                Category: Octave Forge Package
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: Ian Proudler
        Originator Email: ikp1@f2s.com
             Open/Closed: Open
                 Release: 5.2.0
         Discussion Lock: Any
        Operating System: GNU/Linux

    _______________________________________________________

Details:

Octave Forge package ga v 0.10.1

Consider line 68 of crossoverscattered.m:

b(1:n_children, 1:nvars) = randi (1, n_children, nvars); ## TODO: test randi

The command 'help randi' says "Return random integers in the range
1:IMAX." thus line 68 returns a matrix of all ones.

The intention of line 68 is to return a matrix of ones and zeros, thus line 68
ought to be

   b(1:n_children, 1:nvars) = randi (2, n_children, nvars) - 1;

As is 'crossoverscattered()' only selects one 'parent' for 'breeding' and
hence the genetic algorithm routine 'ga()' does not work properly.






    _______________________________________________________

Reply to this item at:

  <https://savannah.gnu.org/bugs/?59299>

_______________________________________________
  Message sent via Savannah
  https://savannah.gnu.org/