vols-methods: Extract an ordered series of 3D volumes.

In bbuchsbaum/neuroim2: Data Structures and IO for Neuroimaging Data with an Emphasis on Functional Magnetic Resonance Imaging (FMRI)

Extract an ordered series of 3D volumes.

Description

This function extracts an ordered series of 3D volumes from an object that supplies volume data. The indices argument specifies the subset of volumes to extract, and can be a vector of indices or a logical vector. The return value is a list containing the extracted volumes in the same order as the specified indices.

Usage

vols(x, indices, ...)

## S4 method for signature 'NeuroVec,numeric'
vols(x, indices)

## S4 method for signature 'NeuroVec,missing'
vols(x)

Arguments

x	the object that supplies the volume data.
indices	the subset of volumes to extract.
...	additional arguments to be passed to methods.

Examples

vec <- read_vec(system.file("extdata", "global_mask_v4.nii", package="neuroim2"))
vs <- vols(vec)
length(vs) == dim(vec)[4]

vs <- vols(vec, indices=1:3)
length(vs) == 3

bbuchsbaum/neuroim2 documentation built on Nov. 3, 2024, 9:31 a.m.