nrrd.raw.to.numeric

R's <code>readBin</code> can read integers of 1, 2 and 4 bytes, but an unsigned 4 byte
integer does not fit into R's signed integer type and there is no integer type of 8 bytes at
all, so these types are interpreted here from their raw bytes. The values are computed in
double precision, which is exact up to 2^53 (for the 64 bit types, larger values lose their low
bits, see the note in <code>read.fs.volume.nrrd</code>).

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) 

nrrd.raw.to.numeric function

<dl><dt>bytes</dt>
<dd>raw vector, the bytes of the values.</dd>
<dt>type_info</dt>
<dd>named list, the R data type information, see <code>nrrd.type.info</code>.</dd>
<dt>endian</dt>
<dd>character string, 'little' or 'big'.</dd></dl>

Arguments

Convert raw bytes of wide integer types into numbers. — nrrd.raw.to.numeric

<dl>

<dt>bytes</dt>
<dd>raw vector, the bytes of the values.</dd>


<dt>type_info</dt>
<dd>named list, the R data type information, see <code>nrrd.type.info</code>.</dd>


<dt>endian</dt>
<dd>character string, 'little' or 'big'.</dd>

</dl>

nrrd.raw.to.numeric: Convert raw bytes of wide integer types into numbers.

Description

Usage

Value

Arguments