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findValidFrameIndices

  findValidFrameIndices returns the indices of valid frames

  Example:
  [idx epochs trigger]=findValidFrameIndices(channel, trigger, duration, pretime)
  where
      channel     is a sigTOOL channels object
      trigger     is a vector of trigger times
      duration    is the duration of the sweep
      pre-time    is the pre-trigger time
   All times are in the same units (as returned by getTimeUnits(channel))

  Returns
      idx         a 2-column vector with the start and end row indices for 
                  each trigger
      epochs      the epochs (columns) that idx refers to
      trigger     an updated copy of the input, with invalid trigger times
                  omitted
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  Author: Malcolm Lidierth 01/08
  Copyright © The Author & King's College London 2008
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  Revisions:
        26.09.09 See within