[FieldTrip] error with ft_redefinetrial

nivethida t dr.nivethida at gmail.com
Thu Aug 27 16:51:30 CEST 2015

Hi all,
I am trying to segment my 5s long dataset into chunks of 500ms.

cfg = [];
cfg.length = 0.5;
cfg.overlap = 0;
data_imwr_rest_seg = ft_redefinetrial(cfg, data_imwr_rest);

Some (not all) of the datasets give me the following error message:

*Index exceeds matrix dimensions.*

*Error in ft_fetch_data (line 104)      count(trlbeg:trlend) =
count(trlbeg:trlend) + 1;Error in ft_redefinetrial (line 246)
data.trial{iTrl} = ft_fetch_data(dataold, 'header', hdr,    'begsample',
begsample, 'endsample', endsample, 'chanindx',    1:hdr.nChans,
'skipcheckdata', 1);Error in ft_redefinetrial (line 304)  data   =
ft_redefinetrial(tmpcfg, data);*
There is also a warning message that appears for all trials -

*Warning: Size input contains non-integer values. This will error ina
future release. Use FLOOR to convert to integer values. > In ft_fetch_data
at 94  In ft_redefinetrial at 246  In ft_redefinetrial at 304 *

Can anyone help me identify what the problem could be?


Dr.Nivethida Thirugnanasambandam,
Postdoctoral Visiting Fellow,
Human Motor Control Section,
National Institute of Neurological Disorders and Stroke,
National Institutes of Health,
Building 10, 7D42,
10 Center Drive, MSC 1428
Bethesda, MD 20892 - 1428
Ph: +1-301-402-6231
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