Accuracy and Stability of Numerical Algorithms by Nicholas J. Higham PDF

By Nicholas J. Higham

Accuracy and balance of Numerical Algorithms supplies a radical, up to date therapy of the habit of numerical algorithms in finite precision mathematics. It combines algorithmic derivations, perturbation idea, and rounding mistakes research, all enlivened through ancient point of view and informative quotations.

This moment variation expands and updates the insurance of the 1st version (1996) and contains a number of advancements to the unique fabric. new chapters deal with symmetric indefinite platforms and skew-symmetric structures, and nonlinear platforms and Newton's approach. Twelve new sections contain assurance of extra mistakes bounds for Gaussian removal, rank revealing LU factorizations, weighted and restricted least squares difficulties, and the fused multiply-add operation discovered on a few sleek computing device architectures.

An multiplied therapy of Gaussian removing comprises rook pivoting, besides a radical dialogue of the alternative of pivoting method and the results of scaling. The book's distinct descriptions of floating element mathematics and of software program concerns replicate the truth that IEEE mathematics is now ubiquitous.

Although no longer designed particularly as a textbook, this re-creation is an appropriate reference for a complicated path. it might even be utilized by teachers in any respect degrees as a supplementary textual content from which to attract examples, ancient standpoint, statements of effects, and routines. With its thorough indexes and vast, updated bibliography, the publication presents a mine of data in a with no trouble available shape.

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Extra resources for Accuracy and Stability of Numerical Algorithms

Example text

This is the accuracy we would expect from GEPP because of the rule of thumb “forward error backward error × condition number”. 9. For general n, the accuracy and stability of Cramer’s rule depend on the method used to evaluate the determinants, and satisfactory bounds are not known even for the case where the determinants are evaluated by GEPP. 2). To see how remarkable a property this is, consider the rounded version of the exact solution: z = fl(x) = x + ∆x, where ||∆x ||2

If we try to extend the analysis above we find that the computed LU factors (as opposed to just the diagonal of U) do not, as a whole, necessarily correspond to a small perturbation of A. A numerical example illustrates these ideas. Let We took a = 10-7 and b = Ae(e = [1,1,1,1]T) and used GE without pivoting in single precision arithmetic (u 6 × 10-8) to solve Ax = b and compute det(A). 3. Not surprisingly, the computed determinant is very accurate. But the computed solution to Ax = b has no correct figures in its first component.

N - 1,1), . . , (2,1); (n,2), . . , (3,2); and so on. 5 plots the relative errors ||Ak - Ak||2/||A||2, where Ak, denotes the matrix computed in single precision arithmetic (u 6 × 10-8). We see that many of the intermediate matrices are very inaccurate, but the final computed has an acceptably small relative error, of order u. Clearly, there is heavy cancellation of errors on the last few stages of the computation. 5. Relative errors ||A k- Â k||2/||A ||2 for Givens QR factorization. The dotted line is the unit roundoff level.

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