Sample and Variable handling

coadd - Reduce resolution through combination of adjacent variables or samples.   [demo]
delsamps - Deletes samples (rows) or variables (columns) from data matrices.   [demo]
lamsel - Determines indices of wavelength axes in specified ranges.   [demo]
shuffle - Randomly re-orders matrix and multiple blocks rows.   [demo]
specedit - GUI for selecting spectral regions on a plot.

unfoldm - Rearranges (unfolds) an augmented matrix to row vectors.   [demo]
unfoldmw - Unfolds multiway arrays along specified order.   [demo]