subject.label: Retrieve label data for a single subject.

In fsbrain: Managing and Visualizing Brain Surface Data

Retrieve label data for a single subject.

Description

Load a label (like 'label/lh.cortex.label') for a subject from disk. Uses knowledge about the FreeSurfer directory structure to load the correct file.

Usage

subject.label(
  subjects_dir,
  subject_id,
  label,
  hemi,
  return_one_based_indices = TRUE,
  full = FALSE
)

Arguments

subjects_dir	string. The FreeSurfer SUBJECTS_DIR, i.e., a directory containing the data for all your subjects, each in a subdir named after the subject identifier.
subject_id	string. The subject identifier
label	string. Name of the label file, without the hemi part. You can include the '.label' suffix. E.g., 'cortex.label' for '?h.cortex.label'. You can also pass just the label (e.g., 'cortex'): if the string does not end with the suffix '.label', that suffix gets added auomatically.
hemi	string, one of 'lh', 'rh', or 'both'. The hemisphere name. Used to construct the names of the label data files to be loaded. For 'both', see the information on the return value.
return_one_based_indices	logical. Whether the indices should be 1-based. Indices are stored zero-based in the file, but R uses 1-based indices. Defaults to TRUE, which means that 1 will be added to all indices read from the file before returning them.
full	logical, whether to return the full label structure instead of only the vertex indices.

Value

integer vector with label data: the list of vertex indices in the label. See 'return_one_based_indices' for important information. If parameter 'hemi' is set to 'both', a named list with entries 'lh' and 'rh' is returned, and the values of are the respective labels.

See Also

Other label data functions: group.label(), labeldata.from.mask(), mask.from.labeldata.for.hemi()

Examples

## Not run: 
   fsbrain::download_optional_data();
   subjects_dir = fsbrain::get_optional_data_filepath("subjects_dir");
   cortex_lh = subject.label(subjects_dir, "subject1", "cortex.label", "lh");

## End(Not run)

fsbrain documentation built on July 9, 2023, 7:12 p.m.