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reference:ft_channelrepair [2018/08/23 14:43] (current)
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 +=====  FT_CHANNELREPAIR =====
 +Note that this reference documentation is identical to the help that is displayed in MATLAB when you type "help ft_channelrepair"​.
 +  <a href=/​reference/​ft_channelrepair><​font color=green>​FT_CHANNELREPAIR</​font></​a>​ repairs bad or missing channels in the data by replacing them with the
 +  plain average of of all neighbours, by a weighted average of all neighbours, by an
 +  interpolation based on a surface Laplacian, or by spherical spline interpolating (see
 +  Perrin et al., 1989).
 +  Use as
 +    [interp] = ft_channelrepair(cfg,​ data)
 +  The configuration must contain
 +    cfg.method ​        = '​weighted',​ '​average',​ '​spline',​ '​slap'​ or '​nan'​ (default = '​weighted'​)
 +    cfg.badchannel ​    = cell-array, see <a href=/​reference/​ft_channelselection><​font color=green>​FT_CHANNELSELECTION</​font></​a>​ for details
 +    cfg.missingchannel = cell-array, see <a href=/​reference/​ft_channelselection><​font color=green>​FT_CHANNELSELECTION</​font></​a>​ for details
 +    cfg.neighbours ​    = neighbourhood structure, see also <a href=/​reference/​ft_prepare_neighbours><​font color=green>​FT_PREPARE_NEIGHBOURS</​font></​a>​
 +    cfg.trials ​        = '​all'​ or a selection given as a 1xN vector (default = '​all'​)
 +    cfg.lambda ​        = regularisation parameter (default = 1e-5, not for method '​distance'​)
 +    cfg.order ​         = order of the polynomial interpolation (default = 4, not for method '​distance'​)
 +  The weighted neighbour approach cannot be used reliably to repair multiple bad channels
 +  that lie next to each other.
 +  If you want to reconstruct channels that are absent in your data, those channels may
 +  also be missing from the sensor definition (grad, elec or opto) and determining the
 +  neighbours is non-trivial. In that case you must use a complete sensor definition from
 +  another dataset or from a template.
 +  The EEG, MEG or NIRS sensor positions can be present in the data or can be specified as
 +    cfg.elec ​         = structure with electrode positions, see <a href=/​reference/​ft_datatype_sens><​font color=green>​FT_DATATYPE_SENS</​font></​a>​
 +    cfg.elecfile ​     = name of file containing the electrode positions, see <a href=/​reference/​ft_read_sens><​font color=green>​FT_READ_SENS</​font></​a>​
 +    cfg.grad ​         = structure with gradiometer definition, see <a href=/​reference/​ft_datatype_sens><​font color=green>​FT_DATATYPE_SENS</​font></​a>​
 +    cfg.gradfile ​     = name of file containing the gradiometer definition, see <a href=/​reference/​ft_read_sens><​font color=green>​FT_READ_SENS</​font></​a>​
 +    cfg.opto ​         = structure with optode definition, see <a href=/​reference/​ft_datatype_sens><​font color=green>​FT_DATATYPE_SENS</​font></​a>​
 +    cfg.optofile ​     = name of file containing the optode definition, see <a href=/​reference/​ft_read_sens><​font color=green>​FT_READ_SENS</​font></​a>​
 +  This function only interpolates data over space, not over time. If you want to
 +  interpolate using temporal information,​ e.g. using a segment of data before and
 +  after the nan-marked artifact, you should use <a href=/​reference/​ft_interpolatenan><​font color=green>​FT_INTERPOLATENAN</​font></​a>​.
 +  To facilitate data-handling and distributed computing you can use
 +    cfg.inputfile ​  ​= ​ ...
 +    cfg.outputfile ​ =  ...
 +  If you specify one of these (or both) the input data will be read from a *.mat
 +  file on disk and/or the output data will be written to a *.mat file. These mat
 +  files should contain only a single variable, corresponding with the
 +  input/​output structure.
 +  See also <a href=/​reference/​ft_megrealign><​font color=green>​FT_MEGREALIGN</​font></​a>,​ <a href=/​reference/​ft_megplanar><​font color=green>​FT_MEGPLANAR</​font></​a>,​ <a href=/​reference/​ft_prepare_neighbours><​font color=green>​FT_PREPARE_NEIGHBOURS</​font></​a>,​ <a href=/​reference/​ft_interpolatenan><​font color=green>​FT_INTERPOLATENAN</​font></​a>​