The method of diagonalizing Hermitian matrices based on a polynomial expansion of the Dirac delta function S( E -H) is further refined so as to accelerate the convergence. Improved choices of the bases used for subspace diagonalization of the matrix, along with accuracy controls and estimates, are i
✦ LIBER ✦
Calculation and application of high-order derivatives of rational functions using matrix heaviside expansion
✍ Scribed by F.L. N-Nagy; M.N. Al-Tikriti
- Publisher
- Elsevier Science
- Year
- 1972
- Tongue
- English
- Weight
- 305 KB
- Volume
- 293
- Category
- Article
- ISSN
- 0016-0032
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## Abstract A discrete fast‐Fourier transform (DFFT) is the preferred method of choice for the rapid evaluation of a set of harmonics of a piecewise‐continuous and periodic transcendental form. For large sets of Fourier components specified to some stringent error criterion, the approach becomes in