FT_DATATYPE_FREQ describes the FieldTrip MATLAB structure for freq data
The freq data structure represents frequency or time-frequency decomposed
channel-level data. This data structure is usually generated with the
FT_FREQANALYSIS function.
An example of a freq data structure containing the powerspectrum for 306 channels
and 120 frequencies is
dimord: 'chan_freq' defines how the numeric data should be interpreted
powspctrm: [306x120 double] the power spectum
label: {306x1 cell} the channel labels
freq: [1x120 double] the frequencies expressed in Hz
cfg: [1x1 struct] the configuration used by the function that generated this data structure
An example of a freq data structure containing the time-frequency resolved
spectral estimates of power (i.e. TFR) for 306 channels, 120 frequencies
and 60 timepoints is
dimord: 'chan_freq_time' defines how the numeric data should be interpreted
powspctrm: [306x120x60 double] the power spectum
label: {306x1 cell} the channel labels
freq: [1x120 double] the frequencies, expressed in Hz
time: [1x60 double] the time, expressed in seconds
cfg: [1x1 struct] the configuration used by the function that generated this data structure
Required fields:
- label, dimord, freq
Optional fields:
- powspctrm, fouriesspctrm, csdspctrm, cohspctrm, time, labelcmb, grad, elec, cumsumcnt, cumtapcnt, trialinfo
Deprecated fields:
- <none>
Obsoleted fields:
- <none>
Revision history:
(2011/latest) The description of the sensors has changed, see FT_DATATYPE_SENS
for further information.
(2008) The presence of labelcmb in case of crsspctrm became optional,
from now on the crsspctrm can also be represented as Nchan * Nchan.
(2006) The fourierspctrm field was added as alternative to powspctrm and
crsspctrm. The fields foi and toi were renamed to freq and time.
(2003v2) The fields sgn and sgncmb were renamed into label and labelcmb.
(2003v1) The initial version was defined.
See also FT_DATATYPE, FT_DATATYPE_COMP, FT_DATATYPE_DIP, FT_DATATYPE_FREQ,
FT_DATATYPE_MVAR, FT_DATATYPE_RAW, FT_DATATYPE_SOURCE, FT_DATATYPE_SPIKE,
FT_DATATYPE_TIMELOCK, FT_DATATYPE_VOLUME