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function [params,result] = optimize( optimdir, params, options, algorithm )
%params = optimize( optimdir, params, options, algorithm )
%
% input:
% optimdir: folder where to optimize
% params: array of structures with parameters to optimize
% .name char string parameter name (e.g. 'length1')
% .value number
% .step number discretization of .value
% .range row vector range of .value (e.g. [1 10])
% .active (0/1) 1=optimize this parameter
% options: structure
% .folder_matlabstart set the startup folder for matlab or octave
% .simfun char string with the simulation function name
% .octave_exe if this field is present, octave is used
% .clean clean the optimization folder before optimization start
% algorithm: 'asco' or 'simplex-downhill'
%
% output:
% params: optimal values
% result: optimization criterion for optimal values
%
% example:
% see openEMS/matlab/examples/optimizer
%
% notes:
% Create a file named 'STOP_OPTIMIZATION' in the optimdir folder to stop
% the optimization process (or press Ctrl+C).
%
% (C) 2010 Sebastian Held <sebastian.held@gmx.de>
error( nargchk(3,4,nargin) );
% default to simplex-downhill
if nargin < 4
algorithm = 'simplex-downhill';
end
if ~strcmp( algorithm, 'asco' )
algorithm = 'simplex-downhill';
end
optimdir = absolutepath( optimdir );
if isfield(options,'clean') && (options.clean == 1)
[a,a,a] = rmdir( optimdir, 's' );
end
[a,a,a] = mkdir( optimdir );
oldfolder = cd( optimdir );
if strcmp( algorithm, 'asco' )
% ---------------------------------------------------------------------
% selected algorithm: ASCO
% http://asco.sourceforge.net/
% if ~exist( 'asco', 'file' ) && ~exist( 'asco.exe', 'file' )
% error 'asco was not found in PATH. Download from http://asco.sf.net/'
% end
% create asco config file
fid = fopen( 'asco.cfg', 'wt' );
fprintf( fid, '* asco configuration file\n' );
fprintf( fid, '* http://asco.sourceforge.net/\n' );
fprintf( fid, '* \n' );
fprintf( fid, '* Optimization for openEMS\n\n' );
fprintf( fid, '#Optimization Flow#\n' );
fprintf( fid, 'Alter:no $do we want to do corner analysis?\n' );
fprintf( fid, 'MonteCarlo:no $do we want to do MonteCarlo analysis?\n' );
fprintf( fid, 'AlterMC cost:0.00 $point below which ALTER and/or MONTECARLO can start\n' );
fprintf( fid, 'ExecuteRF:no $Execute or no the RF module to add RF parasitics?\n' );
fprintf( fid, '#\n\n' );
fprintf( fid, '#DE#\n' );
fprintf( fid, 'choice of method:3\n' );
fprintf( fid, 'maximum no. of iterations:50\n' );
fprintf( fid, 'Output refresh cycle:2\n' );
fprintf( fid, 'No. of parents NP:10\n' );
fprintf( fid, 'Constant F:0.85\n' );
fprintf( fid, 'Crossing Over factor CR:1\n' );
fprintf( fid, 'Seed for pseudo random number generator:3\n' );
fprintf( fid, 'Minimum Cost Variance:1e-6\n' );
fprintf( fid, 'Cost objectives:10\n' );
fprintf( fid, 'Cost constraints:100\n' );
fprintf( fid, '#\n\n' );
fprintf( fid, '# Parameters #\n' );
for n=1:numel(params)
if params(n).active == 1
active = 'OPT';
else
active = '---';
end
value = params(n).value / params(n).step;
range = params(n).range / params(n).step;
fprintf( fid, 'description:#%s#:%i:%i:%i:LIN_INT:%s\n', params(n).name, value, range(1), range(2), active );
end
fprintf( fid, '#\n\n' );
fprintf( fid, '# Measurements #\n' );
fprintf( fid, 'value:---:MIN:0\n' );
fprintf( fid, '#\n\n' );
fclose(fid);
% create extract file
[a,a,a]=mkdir( 'extract' );
fid = fopen( 'extract/value', 'wt' );
fprintf( fid, '# Info #\n' );
fprintf( fid, 'Name:value\n' );
fprintf( fid, 'Symbol:value\n' );
fprintf( fid, '#\n\n' );
fprintf( fid, '# Commands #\n' );
fprintf( fid, '#\n\n' );
fprintf( fid, '# Post Processing #\n' );
fprintf( fid, 'MEASURE_VAR: #SYMBOL#: SEARCH_FOR:''value=''\n' );
fprintf( fid, '#\n' );
fclose(fid);
% create matlab parameter file
fid = fopen( 'asco.txt', 'wt' );
fprintf( fid, '%% this file is processed by asco and variables enclosed in ## are substituted\n' );
fprintf( fid, 'params = [];\n' );
for n=1:numel(params)
fprintf( fid, 'params.%s = #%s# * %i;\n', params(n).name, params(n).name, params(n).step );
end
fclose(fid);
% create shell script
folder_asco_helper = fileparts( mfilename('fullpath') );
asco_sim_helper = 'optimizer_asco_sim';
fid = fopen( 'general.sh', 'wt' );
fprintf( fid, '#!/bin/sh\n' );
fprintf( fid, 'rm "$2.out" 2> /dev/null\n' );
fprintf( fid, 'mv "$1.txt" "$1.m"\n' );
fprintf( fid, 'if [ -f STOP_OPTIMIZATION ]; then\n' );
fprintf( fid, ' exit\n' );
fprintf( fid, 'fi\n' );
fprintf( fid, 'oldpwd=$PWD\n' );
if isfield(options,'folder_matlabstart')
% this allows to start the new matlab process in a specific folder
% => startup.m is picked up here
fprintf( fid, 'cd "%s"\n', functions.folder_matlabstart );
end
if ~isfield(options,'octave_exe')
% matlab
fprintf( fid, '%s/bin/matlab -nodesktop -nosplash -r "cd ''%s''; %s(''%s'',''$1'',''$2.out'',''%s''); exit"\n', matlabroot, folder_asco_helper, asco_sim_helper, optimdir, options.simfun );
else
% octave
fprintf( fid, 'export LD_LIBRARY_PATH=\n' );
fprintf( fid, '%s --silent --eval "cd ''%s''; %s(''%s'',''$1'',''$2.out'',''%s'');"\n', options.octave_exe, folder_asco_helper, asco_sim_helper, optimdir, options.simfun );
end
fprintf( fid, 'cd "$oldpwd"\n' );
fclose(fid);
fileattrib( 'general.sh', '+x' ); % make it executable
% clean up old data
if exist( './best_result.mat', 'file' ), delete( 'best_result.mat' ); end
if exist( './STOP_OPTIMIZATION', 'file' ), delete( 'STOP_OPTIMIZATION' ); end
% start asco
[status,result] = unix( 'asco -general asco.txt', '-echo' );
% get best result
best = load( 'best_result.mat' );
best = best.best;
result = best.result;
for n=1:numel(params)
name = params(n).name;
if isfield(best.params,name)
params(n).value = best.params.(name);
end
end
elseif strcmp( algorithm, 'simplex-downhill' )
% ---------------------------------------------------------------------
% selected algorithm: simplex-downhill
% Thorsten Liebig <thorsten.liebig@uni-due.de>
error( 'not implemented yet' );
end
cd( oldfolder );
function folder = absolutepath( folder )
%folder = absolutepath( folder )
% make the path absolute
if isunix
% Unix
if folder(1) == '/'
return
end
folder = fullfile( pwd, folder );
else
% Windows
folder = strrep( folder, '\', '/' );
if strcmp( folder(2:3), ':/' ) || strcmp( folder(1:2), '//' ) || (folder(1) == '/')
return
end
if (folder(2) == ':') && (folder(3) ~= '/')
error( 'relative paths with drive specifier are not supported' );
end
folder = fullfile( pwd, folder );
end
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