cifti.validate.read.size

Check the requested allocation against the package safety limit
(see <code>validate_allocation_size</code>) and add a CIFTI specific hint to
the error message if it is exceeded: the data of a large file can be read in
parts by selecting matrix columns, which is not possible in the same way for
other image formats.

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) 

cifti.validate.read.size function

<dl><dt>dims</dt>
<dd>integer vector, the dimensions of the requested data matrix.</dd>
<dt>bytes_per_elem</dt>
<dd>numeric, the number of bytes per data value.</dd>
<dt>filepath</dt>
<dd>character string, the path of the file, used in the error message.</dd></dl>

Arguments

Check the safety limit for reading a CIFTI-2 data matrix. — cifti.validate.read.size

<dl>

<dt>dims</dt>
<dd>integer vector, the dimensions of the requested data matrix.</dd>


<dt>bytes_per_elem</dt>
<dd>numeric, the number of bytes per data value.</dd>


<dt>filepath</dt>
<dd>character string, the path of the file, used in the error message.</dd>

</dl>

cifti.validate.read.size: Check the safety limit for reading a CIFTI-2 data matrix.

Description

Usage

Value

Arguments