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 NeuroVec,numeric
vols(x, indices)
# S4 method for 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]
#> [1] TRUE
vs <- vols(vec, indices=1:3)
length(vs) == 3
#> [1] TRUE