/usr/share/octave/packages/ga-0.10.0/__ga_initial_population__.m is in octave-ga 0.10.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program; If not, see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn{Function File} {@var{Population} =} __ga_initial_population__ (@var{GenomeLength}, @var{FitnessFcn}, @var{options})
## Create an initial population.
##
## @seealso{__ga_problem__}
## @end deftypefn
## Author: Luca Favatella <slackydeb@gmail.com>
## Version: 3.3
#TODO consider PopulationSize as a
#vector for multiple subpopolations
function Population = \
__ga_initial_population__ (GenomeLength, FitnessFcn, options)
if (isempty (options.InitialPopulation))
Population(1:options.PopulationSize, 1:GenomeLength) = \
options.CreationFcn (GenomeLength, FitnessFcn, options);
else
if (columns (options.InitialPopulation) != GenomeLength) ## columns (InitialPopulation) > 0
error ("nonempty 'InitialPopulation' must have 'GenomeLength' columns");
else ## rows (InitialPopulation) > 0
nrIP = rows (options.InitialPopulation);
if (nrIP > options.PopulationSize)
error ("nonempty 'InitialPopulation' must have no more than \
'PopulationSize' rows");
elseif (nrIP == options.PopulationSize)
Population(1:options.PopulationSize, 1:GenomeLength) = \
options.InitialPopulation;
else # rows (InitialPopulation) < PopulationSize
## create a complete new population, and then select only needed
## individuals (creating only a partial population is difficult)
CreatedPopulation(1:options.PopulationSize, 1:GenomeLength) = \
options.CreationFcn (GenomeLength, FitnessFcn, options);
Population(1:options.PopulationSize, 1:GenomeLength) = vertcat \
(options.InitialPopulation(1:nrIP, 1:GenomeLength),
CreatedPopulation(1:(options.PopulationSize - nrIP),
1:GenomeLength));
endif
endif
endif
endfunction
%!test
%! GenomeLength = 2;
%! options = gaoptimset ();
%! Population = __ga_initial_population__ (GenomeLength, @rastriginsfcn, options);
%! assert (size (Population), [options.PopulationSize, GenomeLength]);
%!test
%! GenomeLength = 2;
%! options = gaoptimset ("InitialPopulation", [1, 2; 3, 4; 5, 6]);
%! Population = __ga_initial_population__ (GenomeLength, @rastriginsfcn, options);
%! assert (size (Population), [options.PopulationSize, GenomeLength]);
## nonempty 'InitialPopulation' must have 'GenomeLength' columns
%!error
%! GenomeLength = 2;
%! options = gaoptimset ("InitialPopulation", [1; 3; 5]);
%! __ga_initial_population__ (GenomeLength, @rastriginsfcn, options);
%!error
%! GenomeLength = 2;
%! options = gaoptimset ("InitialPopulation", [1, 1, 1; 3, 3, 3; 5, 5, 5]);
%! __ga_initial_population__ (GenomeLength, @rastriginsfcn, options);
## nonempty 'InitialPopulation' must have no more than 'PopulationSize' rows
%!error
%! GenomeLength = 2;
%! options = gaoptimset ("InitialPopulation", [1, 2; 3, 4; 5, 6], "PopulationSize", 2);
%! __ga_initial_population__ (GenomeLength, @rastriginsfcn, options);
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