subset.groups

Extract selected groups from a concatenated matrix.

internal

Provides functions to read and write neuroimaging data in various file formats, with a focus on 'FreeSurfer' formats. This includes, but is not limited to, the following file formats: 1) MGH/MGZ/NIFTI format files, which can contain multi-dimensional images or other data. Typically they contain time-series of three-dimensional brain scans acquired by magnetic resonance imaging (MRI). They can also contain vertex-wise measures of surface morphometry data. The MGH format is named after the Massachusetts General Hospital, and the MGZ format is a compressed version of the same format. 2) 'FreeSurfer' morphometry data files in binary 'curv' format. These contain vertex-wise surface measures, i.e., one scalar value for each vertex of a brain surface mesh. These are typically values like the cortical thickness or brain surface area at each vertex. 3) Annotation file format. This contains a brain surface parcellation derived from a cortical atlas. 4) Surface file format. Contains a brain surface mesh, given by a list of vertices and a list of faces.

Tim Schc3<a4>fer

freesurferformats

Read and Write 'FreeSurfer' Neuroimaging File Formats

Tim Schäfer

Van Essen Lab 

Montreal Neurological Institute (MNI) 

subset.groups function

<dl><dt>points</dt>
<dd>numeric matrix holding the concatenated rows of all groups.</dd>
<dt>lengths</dt>
<dd>integer vector with the number of rows of each group.</dd>
<dt>sel</dt>
<dd>integer vector, the indices of the groups to extract.</dd></dl>

Arguments

Extract selected groups from a concatenated matrix. — subset.groups

<dl>

<dt>points</dt>
<dd>numeric matrix holding the concatenated rows of all groups.</dd>


<dt>lengths</dt>
<dd>integer vector with the number of rows of each group.</dd>


<dt>sel</dt>
<dd>integer vector, the indices of the groups to extract.</dd>

</dl>

subset.groups: Extract selected groups from a concatenated matrix.

Description

Usage

Value

Arguments