[FieldTrip] Error in using EMG channel as trial definition

[Abhishek Samal]

Sir,
This is Abhishek. I am trying to analyse Motor Evoked field MEG data. I
have been trying to use the EMG channel as the trial definition for the
triggers of epoch creation. But when I use the script that is given in
tutorial definition I am getting the following error.

The Input

cfg = [];
cfg.dataset    = 'preetham_lt_motor_raw_tsss_mc.fif';
cfg.trialdef.prestim        = 1;
cfg.trialdef.poststim       = 0.5;
cfg.trialfun  = 'trialfun_emgdetect';
cfg           = ft_definetrial(cfg);
data          = ft_preprocessing(cfg);

The Error

306 MEG channel locations transformed
Reading preetham_lt_motor_raw_tsss_mc.fif ...
Opening raw data file preetham_lt_motor_raw_tsss_mc.fif...
Range : 124000 ... 669999  =     62.000 ...   335.000 secs
Ready.
Reading 124000 ... 669999  =     62.000 ...   335.000 secs... [done]
found 0 events
created 210265 trials
the call to "ft_definetrial" took 528 seconds
306 MEG channel locations transformed
Reading preetham_lt_motor_raw_tsss_mc.fif ...
Opening raw data file preetham_lt_motor_raw_tsss_mc.fif...
Range : 124000 ... 669999  =     62.000 ...   335.000 secs
Ready.
processing channel { 'EOG001' 'ECG002' 'EEG001' 'EEG002' 'EEG003' 'EEG004'
'EEG005' 'EEG006' 'EEG007' 'EEG008' 'EEG009' 'EEG010' 'EEG011' 'EEG012'
'EEG013' 'EEG014' 'EEG015' 'EEG016' 'EEG017' 'EEG018' 'EEG019' 'EEG020'
'EEG021' 'EEG022' 'EEG023' 'EEG024' 'EEG025' 'EXCI' 'IASX+' 'IASX-' 'IASY+'
'IASY-' 'IASZ+' 'IASZ-' 'IAS_DX' 'IAS_DY' 'IAS_X' 'IAS_Y' 'IAS_Z' 'MEG0111'
'MEG0112' 'MEG0113' 'MEG0121' 'MEG0122' 'MEG0123' 'MEG0131' 'MEG0132'
'MEG0133' 'MEG0141' 'MEG0142' 'MEG0143' 'MEG0211' 'MEG0212' 'MEG0213'
'MEG0221' 'MEG0222' 'MEG0223' 'MEG0231' 'MEG0232' 'MEG0233' 'MEG0241'
'MEG0242' 'MEG0243' 'MEG0311' 'MEG0312' 'MEG0313' 'MEG0321' 'MEG0322'
'MEG0323' 'MEG0331' 'MEG0332' 'MEG0333' 'MEG0341' 'MEG0342' 'MEG0343'
'MEG0411' 'MEG0412' 'MEG0413' 'MEG0421' 'MEG0422' 'MEG0423' 'MEG0431'
'MEG0432' 'MEG0433' 'MEG0441' 'MEG0442' 'MEG0443' 'MEG0511' 'MEG0512'
'MEG0513' 'MEG0521' 'MEG0522' 'MEG0523' 'MEG0531' 'MEG0532' 'MEG0533'
'MEG0541' 'MEG0542' 'MEG0543' 'MEG0611' 'MEG0612' 'MEG0613' 'MEG0621'
'MEG0622' 'MEG0623' 'MEG0631' 'MEG0632' 'MEG0633' 'MEG0641' 'MEG0642'
'MEG0643' 'MEG0711' 'MEG0712' 'MEG0713' 'MEG0721' 'MEG0722' 'MEG0723'
'MEG0731' 'MEG0732' 'MEG0733' 'MEG0741' 'MEG0742' 'MEG0743' 'MEG0811'
'MEG0812' 'MEG0813' 'MEG0821' 'MEG0822' 'MEG0823' 'MEG0911' 'MEG0912'
'MEG0913' 'MEG0921' 'MEG0922' 'MEG0923' 'MEG0931' 'MEG0932' 'MEG0933'
'MEG0941' 'MEG0942' 'MEG0943' 'MEG1011' 'MEG1012' 'MEG1013' 'MEG1021'
'MEG1022' 'MEG1023' 'MEG1031' 'MEG1032' 'MEG1033' 'MEG1041' 'MEG1042'
'MEG1043' 'MEG1111' 'MEG1112' 'MEG1113' 'MEG1121' 'MEG1122' 'MEG1123'
'MEG1131' 'MEG1132' 'MEG1133' 'MEG1141' 'MEG1142' 'MEG1143' 'MEG1211'
'MEG1212' 'MEG1213' 'MEG1221' 'MEG1222' 'MEG1223' 'MEG1231' 'MEG1232'
'MEG1233' 'MEG1241' 'MEG1242' 'MEG1243' 'MEG1311' 'MEG1312' 'MEG1313'
'MEG1321' 'MEG1322' 'MEG1323' 'MEG1331' 'MEG1332' 'MEG1333' 'MEG1341'
'MEG1342' 'MEG1343' 'MEG1411' 'MEG1412' 'MEG1413' 'MEG1421' 'MEG1422'
'MEG1423' 'MEG1431' 'MEG1432' 'MEG1433' 'MEG1441' 'MEG1442' 'MEG1443'
'MEG1511' 'MEG1512' 'MEG1513' 'MEG1521' 'MEG1522' 'MEG1523' 'MEG1531'
'MEG1532' 'MEG1533' 'MEG1541' 'MEG1542' 'MEG1543' 'MEG1611' 'MEG1612'
'MEG1613' 'MEG1621' 'MEG1622' 'MEG1623' 'MEG1631' 'MEG1632' 'MEG1633'
'MEG1641' 'MEG1642' 'MEG1643' 'MEG1711' 'MEG1712' 'MEG1713' 'MEG1721'
'MEG1722' 'MEG1723' 'MEG1731' 'MEG1732' 'MEG1733' 'MEG1741' 'MEG1742'
'MEG1743' 'MEG1811' 'MEG1812' 'MEG1813' 'MEG1821' 'MEG1822' 'MEG1823'
'MEG1831' 'MEG1832' 'MEG1833' 'MEG1841' 'MEG1842' 'MEG1843' 'MEG1911'
'MEG1912' 'MEG1913' 'MEG1921' 'MEG1922' 'MEG1923' 'MEG1931' 'MEG1932'
'MEG1933' 'MEG1941' 'MEG1942' 'MEG1943' 'MEG2011' 'MEG2012' 'MEG2013'
'MEG2021' 'MEG2022' 'MEG2023' 'MEG2031' 'MEG2032' 'MEG2033' 'MEG2041'
'MEG2042' 'MEG2043' 'MEG2111' 'MEG2112' 'MEG2113' 'MEG2121' 'MEG2122'
'MEG2123' 'MEG2131' 'MEG2132' 'MEG2133' 'MEG2141' 'MEG2142' 'MEG2143'
'MEG2211' 'MEG2212' 'MEG2213' 'MEG2221' 'MEG2222' 'MEG2223' 'MEG2231'
'MEG2232' 'MEG2233' 'MEG2241' 'MEG2242' 'MEG2243' 'MEG2311' 'MEG2312'
'MEG2313' 'MEG2321' 'MEG2322' 'MEG2323' 'MEG2331' 'MEG2332' 'MEG2333'
'MEG2341' 'MEG2342' 'MEG2343' 'MEG2411' 'MEG2412' 'MEG2413' 'MEG2421'
'MEG2422' 'MEG2423' 'MEG2431' 'MEG2432' 'MEG2433' 'MEG2441' 'MEG2442'
'MEG2443' 'MEG2511' 'MEG2512' 'MEG2513' 'MEG2521' 'MEG2522' 'MEG2523'
'MEG2531' 'MEG2532' 'MEG2533' 'MEG2541' 'MEG2542' 'MEG2543' 'MEG2611'
'MEG2612' 'MEG2613' 'MEG2621' 'MEG2622' 'MEG2623' 'MEG2631' 'MEG2632'
'MEG2633' 'MEG2641' 'MEG2642' 'MEG2643' 'STI101' 'SYS201' 'CHPI001'
'CHPI002' 'CHPI003' 'CHPI004' 'CHPI005' 'CHPI006' 'CHPI007' 'CHPI008'
'CHPI009' }
reading and preprocessing
reading and preprocessing trial 1 from 210265
Reading 264027 ... 4792reading and preprocessing trial 2 from 210265
Reading 327742 ... 4802reading and preprocessing trial 3 from 210265
.
.
.
.
.
Reading 635443 ... 66reading and preprocessing trial 116 from 210265
Error using ft_read_data (line 225)
cannot read data after the end of the file

Error in ft_preprocessing (line 582)
      dat = ft_read_data(cfg.datafile, 'header', hdr, 'begsample',
begsample, 'endsample', endsample, 'chanindx', rawindx,
      'checkboundary', strcmp(cfg.continuous, 'no'), 'dataformat',
cfg.dataformat);



I am new to fieldtrip. Please help me with the above error.
Regards,
Abhishek.
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