/usr/share/doc/octave-gdf/examples/gdf_spatial.m is in octave-gdf 0.1.2-2.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 | function gdf_spatial( filtermatrix, inputfile, outputfile, labels )
% apply spatial filter matrix to a gdf
% load gdf file
[signals, header, events] = gdf_reader( inputfile, 'dataformat', 'matrix' );
num_channels = size( filtermatrix, 1 );
% apply filter
signals = filtermatrix * signals;
header.signals( num_channels+1 : end ) = [];
for c = 1 : num_channels
header.signals( c ).label = labels{c};
end
% 4. save new gdf
handle = gdf_writer( 'init' );
for c = 1 : num_channels
gdf_writer( 'createsignal', handle, c );
end
gdf_writer( 'setheader', handle, header );
gdf_writer( 'recordduration', handle, 0 ); % automatic record duration
gdf_writer( 'eventconfig', handle, events.mode, events.sample_rate );
gdf_writer( 'open', handle, outputfile );
chunksize = 512;
num_chunks = ceil(size(signals,2) / chunksize);
for d = 1 : num_chunks
for c = 1 : num_channels
start = (d-1)*chunksize + 1;
ende = min( d*chunksize, size(signals,2) );
gdf_writer( 'blitsamples', handle, c, signals(c,start:ende) );
end
end
if events.mode == 1
for e = 1 : length( events.position )
gdf_writer( 'mode1ev', handle, events.position(e), events.event_code(e) );
end
elseif events.mode == 3
for e = 1 : length( events.position )
gdf_writer( 'mode3ev', handle, events.position(e), events.event_code(e), events.channel(e), events.duration(e) );
end
end
gdf_writer( 'close', handle );
gdf_writer( 'clear', handle );
end
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