# Applied Numerical Linear Algebra by James W. Demmel By James W. Demmel

Attractive! Very easily, a good way to have an perception on linear algebraic methods, and why this and that occurs so and so, this can be the ebook. Topic-wise, it truly is nearly whole for a primary therapy. every one bankruptcy starts off with a gradual creation, construction instinct after which will get into the formal fabric. the fashion is reliable.

Although speaking approximately techniques, it additionally makes an attempt to provide a few geometric instinct right here and there. It helps.

This isn't a reference ebook even though. you can't locate each vital procedure.

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Additional resources for Applied Numerical Linear Algebra

Example text

The rest of this chapter is organized as follows. 4. 3 derives the Gaussian elimination algorithm for dense matrices. 4 analyzes the errors in Gaussian elimination and presents practical error bounds. 5 shows how to improve the accuracy of a solution computed by Gaussian elimination, using a simple and inexpensive iterative method. 6. 7 discusses faster variations of Gaussian elimination for matrices with special properties commonly arising in practice, such as symmetry (A = AT) or sparsity (when many entries of A are zero).

We choose to present one that is widely applicable to problems besides solving Ax = 6, at the cost of being slightly slower than algorithms specialized for Ax — b (but it is still reasonably fast). Our estimator, like most others, is guaranteed to produce only a lower bound on ||A-1||, not an upper bound. Empirically, it is almost always within a factor of 10, and usually 2 to 3, of || A-l ||. 43 times too small at worst. This is more than accurate enough to estimate the number of correct decimal digits in the final answer.

In both cases they grow slowly with dimension, as expected. 2 shows our two upper bounds for the backward error, 3n3 gPP (or 3n3 g CP ) and 3n " . 2. 1 • 10~16. Both bounds are indeed bounds on the true backward error but are too large by several order of magnitude. m. 3. 5), we need to estimate ||A-1||. || • ||A||, since ||A|| is easy to compute. One approach is to compute A-l explicitly and compute its norm. However, this would cost 2n3, more than the original 3 for Gaussian elimination. (Note that this implies that it is not cheaper to solve Ax = b by computing A-l and then multiplying it by b.