lookup: Index Lookup operation

In bbuchsbaum/neuroim2: Data Structures for Brain Imaging Data

Index Lookup operation

Description

Index Lookup operation

Usage

lookup(x, i, ...)

Arguments

x	the object to query
i	the index to lookup
...	additional arguments

Value

The value(s) at the specified index/indices of x.

Examples

# Create a 64x64x64 space
space <- NeuroSpace(c(64, 64, 64), c(1, 1, 1), c(0, 0, 0))

# Create a lookup volume with first 100 indices
ilv <- IndexLookupVol(space, 1:100)

# Look up values for indices 1, 2, and 3
# Returns their positions in the sparse representation
lookup(ilv, c(1, 2, 3))

# Look up values outside the included indices
# Returns 0 for indices not in the lookup volume
lookup(ilv, c(101, 102))

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