Behaviour of 'global', differences Octave/Matlab?

[John W. Eaton]

If you think you've found a bug in Octave, please submit a complete
bug report to the address@hidden list.  In this case, it would be
useful if you could submit a complete working example that could be
used to reproduce the problem.

I have no plans to do anything about this issue until I have a
complete example that I can run that demonstrates the problem.
Submitting a patch with a proposed fix would also be welcome.

jwe



On 19-Feb-2007, Andreas Romeyke wrote:

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| Hi all,
| 
| I am trying[1] to run a Matlab toolbox (eeglab[2]) under Octave 2.9.9
| and Octave stops in the main-function eeglab() with following error:
| 
| error: can't make function parameter `EEG' global
| 
| error: evaluating global command near line 64, column 1
| 
| error: near line 64 of file
| `/SCR/svn_work/eeglab-devel-5.03/eeglab5.03/functions/eeg_global.m'
| 
| error: called from `eeglab' in file
| `/SCR/svn_work/eeglab-devel-5.03/eeglab5.03/eeglab.m'
| 
| 
| The original developers of the tool box uses an external m-file called
| eeg_global.m with
| 
| % global variables
| 
| % ----------------
| 
| global EEG;             % current dataset
| 
| global ALLEEG;          % all datasets
| 
| global CURRENTSET;      % current set index
| 
| global ALLCOM;          % all commands (history)
| 
| global LASTCOM;         % last command
| 
| global STUDY;
| 
| global CURRENTSTUDY;
| 
| 
| This file is called in the eeglab.m (around line 1700):
| 
| [..]
| 
| eeglab_options;
| 
| if nargin == 1 &&  strcmp(onearg, 'redraw')
| 
|     if evalin('base', 'exist(''EEG'')', '0') == 1
| 
|         evalin('base', 'warning off; eeg_global; warning on;');
| 
|     end;
| 
| end;
| 
| eeg_global;
| 
| 
| % for the history function
| 
| % ------------------------
| 
| comtmp = 'warning off MATLAB:mir_warning_variable_used_as_function';
| 
| evalin('base'  , comtmp, '');
| 
| evalin('caller', comtmp, '');
| 
|     
| 
| evalin('base', 'eeg_global;');
| 
| if nargin < 1 || exist('EEG') ~= 1
| 
|     clear global EEG ALLEEG CURRENTSET ALLCOM LASTCOM STUDY;
| 
|     CURRENTSTUDY = 0;
| 
|     eeg_global;
| 
|     EEG = eeg_emptyset;
| 
|     eegh('[ALLEEG EEG CURRENTSET ALLCOM] = eeglab;');
| 
|     if get(0, 'screendepth') <= 8
| 
|         disp('Warning: screen color depth too low, some colors will be
| inaccurate in time-frequency plots');
| 
|     end;
| 
| end;
| 
| [..]
| 
| Does it means the Octave does not allow making variables global by
| calling external m-file? What will be a workaround with less changes
| as possible to the original code? Any additional hints?
| 
| Bye Andreas
| 
| [1] ignoring the GUI stuff by using wrappers...
| [2] eeglab is a free toolbox to process eeg-data, the main-site is:
| http://sccn.ucsd.edu/eeglab/, we develop a testsuite to make a
| conversion to Octave possible (at least one or two years), see
| https://svnserv.cbs.mpg.de/eeglab
| 
| - --
| Software Developer / Dipl. Inform. (FH)
| Max Planck Institute for Human Cognitive and Brain Sciences
| Department of Psychology
| Stephanstr. 1a, 04103 Leipzig, Germany
| 
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