Afternotes on Numerical Analysis by G. W. Stewart

By G. W. Stewart

There are various textbooks to choose between whilst instructing an introductory numerical research direction, yet there's just one Afternotes on Numerical research. This e-book provides the important rules of recent numerical research in a bright and easy model with at the least fuss and ritual. Stewart designed this quantity whereas instructing an upper-division direction in introductory numerical research. to explain what he was once instructing, he wrote down every one lecture instantly after it used to be given. the outcome displays the wit, perception, and verbal craftmanship that are hallmarks of the writer. easy examples are used to introduce each one subject, then the writer fast strikes directly to the dialogue of vital tools and strategies. With its wealthy mix of graphs and code segments, the booklet presents insights and suggestion that support the reader stay away from the various pitfalls in numerical computation which could simply capture an unwary newbie.

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We will assume that g is twice differentiate. 19. Since /'(x) = m(x — x^]rn~lg(x] + (x — x*) m (/(x), the Newton iteration function for / is From this we see that (p is well defined at x* and According to fixed-point theory, we have only to evaluate the derivative of (/? at x* to determine if x* is an attractive fixed point. We will skip the slightly tedious differentiation and get straight to the result: Therefore, Newton's method converges to a multiple zero from any sufficiently close approximation, and the convergence is linear with ratio 1 — —.

2) This iteration is called the secant method. 1. The secant method. 3. The secant method derives its name from the following geometric interpretation of the iteration. Given XQ and xi, draw the secant line through the graph of / at the points (XQ,/(XQ)) and (#1,/(xi)). The point #2 is the abscissa of the intersection of the secant line with the x-axis. 1 illustrates this procedure. As usual, a graph of this kind can tell us a lot about the convergence of the method in particular cases. 4. 2) can be written in the form Thus (f> plays the role of an iteration function.

Armed with this result, we can return to Newton's method and the constant slope method. For Newton's method we have (remember that /'(#*) is assumed to be nonzero). Thus Newton's method is seen to be at least quadratically convergent. Since Newton's method will converge faster than quadratically only when f " ( x * ) = 0. 3). 24 Afternotes on Numerical Analysis Multiple zeros 17. Up to now we have considered only a simple zero of the function /, that is, a zero for which /'(#*) ^ 0. We will now consider the case where By Taylor's theorem where £x lies between x* and x.

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