# Compact Numerical Methods for Computers Linear Algebra and by John C. Nash

By John C. Nash

Designed to assist humans clear up numerical difficulties on small pcs, this book's major topic parts are numerical linear algebra, functionality minimization and root-finding. This variation has been revised and up-to-date, the most distinction being that the algorithms are offered in faster Pascal.

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Additional resources for Compact Numerical Methods for Computers Linear Algebra and Function Minimisation

Example text

If a linear combination of some functions fi, j = 1, 2, . . 56) arises. 1). 1. INTRODUCTION This chapter presents an algorithm for accomplishing the powerful and versatile singular-value decomposition. This allows the solution of a number of problems to be realised in a way which permits instabilities to be identified at the same time. This is a general strategy I like to incorporate into my programs as much as possible since I find succinct diagnostic information invaluable when users raise questions about computed answers-users do not in general raise too many idle questions!

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16) will be donated ai, i = 1, 2, . . , n. 17) Since two columns orthogonalised in one rotation may be made non-orthogonal in subsequent rotations, it is essential that this measure be reduced at each rotation. 34 Compact numerical methods for computers Because only two columns are involved in the kth rotation, we have Z(k) = Z(k-1) + (XT Y)2 – (x T y) 2 . 19) so that the non-orthogonality is reduced at each rotation. g. 21) v = (4p2 + q2) ½ . 26) where } 1 sgn (p) = –1 for p > 0 for p < 0. 27) Note that having two forms for the calculation of the functions of the angle of rotation permits the subtraction of nearly equal numbers to be avoided.