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Read binary data as single when single precision is enabled #963

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Merged
arnodelorme merged 1 commit into from
Sep 9, 2026
Merged

Read binary data as single when single precision is enabled #963

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9 changes: 6 additions & 3 deletions functions/adminfunc/eeg_getdatact.m
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Original file line number Diff line number Diff line change
Expand Up @@ -238,24 +238,27 @@
% reading data file
% -----------------
eeglab_options;
% read directly in single precision when requested; reading as double first
% needs twice the memory and is much slower for large files
if option_single, precision = 'float32=>single'; else, precision = 'float32'; end
if length(opt.channel) == EEG.nbchan && option_memmapdata
fclose(fid);
data = mmo(filename, [EEG.nbchan EEG.pnts EEG.trials], false);
%data = memmapdata(filename, [EEG.nbchan EEG.pnts EEG.trials]);
else
if datformat
if length(opt.channel) == EEG.nbchan || ~isempty(opt.interp)
data = fread(fid, [EEG.trials*EEG.pnts EEG.nbchan], 'float32')';
data = fread(fid, [EEG.trials*EEG.pnts EEG.nbchan], precision)';
else
data = repmat(single(0), [ length(opt.channel) EEG.pnts EEG.trials ]);
for ind = 1:length(opt.channel)
fseek(fid, (opt.channel(ind)-1)*EEG.pnts*EEG.trials*4, -1);
data(ind,:) = fread(fid, [EEG.trials*EEG.pnts 1], 'float32')';
data(ind,:) = fread(fid, [EEG.trials*EEG.pnts 1], precision)';
end
opt.channel = [1:size(data,1)];
end
else
data = fread(fid, [EEG.nbchan Inf], 'float32');
data = fread(fid, [EEG.nbchan Inf], precision);
end
fclose(fid);
end
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