linear_access-methods: Linear Access Method for FileBackedNeuroVec

In bbuchsbaum/neuroim2: Data Structures for Brain Imaging Data

Linear Access Method for FileBackedNeuroVec

Description

Internal method providing linear access to memory-mapped data.

Provides linear access to the data across all vectors in the sequence.

Usage

## S4 method for signature 'FileBackedNeuroVec,numeric'
linear_access(x, i)

## S4 method for signature 'MappedNeuroVec,numeric'
linear_access(x, i)

## S4 method for signature 'NeuroHyperVec,ANY'
linear_access(x, i, ...)

## S4 method for signature 'NeuroVecSeq,numeric'
linear_access(x, i)

## S4 method for signature 'SparseNeuroVol,numeric'
linear_access(x, i)

## S4 method for signature 'AbstractSparseNeuroVec,numeric'
linear_access(x, i)

Arguments

x	A NeuroVecSeq object
i	Numeric vector of indices for linear access
...	Additional arguments (not used)

Value

Numeric vector of accessed values

Examples

# Create a small NeuroVec and save it
nvec <- NeuroVec(matrix(1:32, 8, 4), NeuroSpace(c(2,2,2,4)))
tmp <- tempfile(fileext = ".nii")
write_vec(nvec, tmp)

# Load as FileBackedNeuroVec and access values
fbvec <- FileBackedNeuroVec(tmp)
values <- linear_access(fbvec, 1:10)

# Clean up
unlink(tmp)

bbuchsbaum/neuroim2 documentation built on Feb. 26, 2025, 3:49 p.m.