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reference:ft_datatype_raw [2018/08/23 14:43]
reference:ft_datatype_raw [2018/08/23 14:43] (current)
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 +=====  FT_DATATYPE_RAW =====
 +Note that this reference documentation is identical to the help that is displayed in MATLAB when you type "help ft_datatype_raw"​.
 +  <a href=/​reference/​ft_datatype_raw><​font color=green>​FT_DATATYPE_RAW</​font></​a>​ describes the FieldTrip MATLAB structure for raw data
 +  The raw datatype represents sensor-level time-domain data typically
 +  obtained after calling <a href=/​reference/​ft_definetrial><​font color=green>​FT_DEFINETRIAL</​font></​a>​ and <a href=/​reference/​ft_preprocessing><​font color=green>​FT_PREPROCESSING</​font></​a>​. It contains
 +  one or multiple segments of data, each represented as Nchan X Ntime
 +  arrays.
 +  An example of a raw data structure with 151 MEG channels is
 +           ​label:​ {151x1 cell}      the channel labels (e.g. '​MRC13'​)
 +            time: {1x266 cell}      the timeaxis [1*Ntime double] per trial
 +           ​trial:​ {1x266 cell}      the numeric data [151*Ntime double] per trial
 +      sampleinfo: [266x2 double] ​   the begin and endsample of each trial relative to the recording on disk
 +       ​trialinfo:​ [266x1 double] ​   optional trigger or condition codes for each trial
 +             hdr: [1x1 struct] ​     the full header information of the original dataset on disk
 +            grad: [1x1 struct] ​     information about the sensor array (for EEG it is called elec)
 +            cfg: [1x1 struct] ​      the configuration used by the function that generated this data structure
 +  Required fields:
 +    - time, trial, label
 +  Optional fields:
 +    - sampleinfo, trialinfo, grad, elec, opto, hdr, cfg
 +  Deprecated fields:
 +    - fsample
 +  Obsoleted fields:
 +    - offset
 +  Revision history:
 +  (2011/​latest) The description of the sensors has changed, see <a href=/​reference/​ft_datatype_sens><​font color=green>​FT_DATATYPE_SENS</​font></​a>​
 +  for further information.
 +  (2010v2) The trialdef field has been replaced by the sampleinfo and
 +  trialinfo fields. The sampleinfo corresponds to trl(:,1:2), the trialinfo
 +  to trl(4:end).
 +  (2010v1) In 2010/Q3 it shortly contained the trialdef field which was a copy
 +  of the trial definition (trl) is generated by <a href=/​reference/​ft_definetrial><​font color=green>​FT_DEFINETRIAL</​font></​a>​.
 +  (2007) It used to contain the offset field, which correcponds to trl(:,3).
 +  Since the offset field is redundant with the time axis, the offset field is
 +  from now on not present any more. It can be recreated if needed.
 +  (2003) The initial version was defined
 +  See also <a href=/​reference/​ft_datatype><​font color=green>​FT_DATATYPE</​font></​a>,​ <a href=/​reference/​ft_datatype_comp><​font color=green>​FT_DATATYPE_COMP</​font></​a>,​ <a href=/​reference/​ft_datatype_timelock><​font color=green>​FT_DATATYPE_TIMELOCK</​font></​a>,​ <a href=/​reference/​ft_datatype_freq><​font color=green>​FT_DATATYPE_FREQ</​font></​a>,​
 +  <a href=/​reference/​ft_datatype_spike><​font color=green>​FT_DATATYPE_SPIKE</​font></​a>,​ <a href=/​reference/​ft_datatype_sens><​font color=green>​FT_DATATYPE_SENS</​font></​a>​