Techniques for the compression of sequences of integer numbers and real numbers with fixed absolute precision
✍ Scribed by Omar G. Stradella; Giorgina Corongiu; Enrico Clementi
- Publisher
- John Wiley and Sons
- Year
- 1993
- Tongue
- English
- Weight
- 657 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0192-8651
No coin nor oath required. For personal study only.
✦ Synopsis
Algorithms to reduce the space needed to store information either in memory or magnetic media are presented. These algorithms were designed to pack and unpack two common kinds of data types: sequences of sets of integers that change in a regular fashion and real numbers of fixed absolute precision. One typical application of these techniques is in the storage of electron repulsion integrals in ah initio calculations, where the indices of the basis functions are a good example of data of the first type and the integrals of the second type. In this case, savings in storage space of 50% or more can be obtained with reasonable accuracies in the energies. FORTRAN subroutines are presented for packing/unpacking indices and integrals both in the IBM and IEEE 754 64-bit floating point formats.