Get Indices from an IndexLookupVol Object
Source:R/index_vol.R, R/roi.R, R/sparse_neurovec.R
      indices-methods.RdRetrieves the vector of indices that are included in the lookup volume.
Arguments
- x
- An - IndexLookupVolobject
Examples
space <- NeuroSpace(c(64, 64, 64), c(1, 1, 1), c(0, 0, 0))
ilv <- IndexLookupVol(space, c(1:100))
idx <- indices(ilv)  # Get included indices