It is also a way to store a large array of numbers, where many of the entries are zero. By omitting the zeroes, and instead storing the indices along with the values of the non-zero items, less space may be used in total. It only makes sense if the extra space used for storing the indices (on average) is smaller than the space saved by not storing the zeroes.
Findings from European Organization for Nuclear Research (CERN) Update Understanding of Nuclear Science and Technology
Aug 13, 2013; By a News Reporter-Staff News Editor at Journal of Technology -- Current study results on Nuclear Science and Technology have...