Return voxel dimensions (by default absolute voxel dimensions)

nrrd.voxdims(file, ReturnAbsoluteDims = TRUE)

## Arguments

file path to nrrd/nhdr file or a list containing a nrrd header Defaults to returning absolute value of dims even if there are any negative space directions

## Value

numeric vector of voxel dimensions (NA_real_ when missing) of length equal to the image dimension.

## Details

NB Can handle off diagonal terms in space directions matrix, BUT assumes that space direction vectors are orthogonal.

Will produce a warning if no valid dimensions can be found.

Other nrrd: is.nrrd(), read.nrrd(), write.nrrd()