cifti.compute.index.ranges: Compute the index ranges of brain model entries.

In freesurferformats: Read and Write 'FreeSurfer' Neuroimaging File Formats

Compute the index ranges of brain model entries.

Description

The IndexOffset and IndexCount fields of a brain model entry say which matrix entries it covers. They are derived from the index lists (and from the surface sizes or the volume for a model that covers everything), and they have to cover the dimension without gaps, so they are always computed here rather than taken from the caller.

Usage

cifti.compute.index.ranges(models, volume = NULL)

Arguments

models	list of brain model entries, see cifti.brain.model.surface.
volume	a volume or NULL, see cifti.volume. Needed for a volume model that has no voxel index list (which covers all voxels of the volume).

Value

the models, with index_offset and index_count set.

freesurferformats documentation built on Sept. 25, 2026, 1:07 a.m.