Difference: DocsSectionsTroubleshooting (14 vs. 15)

Revision 1511 Nov 2009 - Main.MarianneSeverens

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6 TROUBLESHOOTING AND FAQ

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  This happens if no data selection was specified for corresponding marker. Check if the '!DataSelection' table defines data for this marker. (future versions will check the table for such failure and issue an error. For more information click here.

I get an error 'can not read data before t=0', however dataselections begintime was set to t=0 s.
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If you insert a marker with zero time-delay at the BS_INIT marker, this inserted markers timestamp will also be set to t=0. Data selection definition is interpreted relative to this timestamp. Although DataSelection begintime t=0 was specified, the extra samples required for the decimation filtering moves the start position towards values < 0. This risc exists for every marker which absolute DataSelection begintime effectual becomes a value smaller than 0.1s. Thus, inserted markers timestamp plus begintime should be larger than 0.1s, but only if data is being decimated. Data will be decimated if RunMode.SampleRateAfterDecimation is not equal to the original sample rate (either from data source or file). In case no decimation is applied, effectual DataSelection? begintimes can be set to t=0 s.
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If you insert a marker with zero time-delay at the BS_INIT marker, this inserted markers timestamp will also be set to t=0. Data selection definition is interpreted relative to this timestamp. Although DataSelection begintime t=0 was specified, the extra samples required for the decimation filtering moves the start position towards values < 0. This risc exists for every marker which absolute DataSelection begintime effectual becomes a value smaller than 0.1s. Thus, inserted markers timestamp plus begintime should be larger than 0.1s, but only if data is being decimated. Data will be decimated if RunMode.SampleRateAfterDecimation is not equal to the original sample rate (either from data source or file). In case no decimation is applied, effectual DataSelection begintimes can be set to t=0 s.
 
I defined actions for a marker, however nothing seems to execute?
Check if the marker did pop up in the data stream. If so, check if the time point for these actions was specified in the table. (BrainStream should warn for missing time point information)
 
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