On Condition Numbers and the Distance to the Nearest Ill-Posed Problem (Classic Reprint) - Brossura

Demmel, James W.

Brossura

ISBN 10: 1334018197 ISBN 13: 9781334018190

Casa editrice: Forgotten Books, 2018

Riassunto

Excerpt from On Condition Numbers and the Distance to the Nearest Ill-Posed Problem

The condition number of a problem measures the sensitivity of the answer to small changes in the input. We call the problem ill-posed if its condition number is infinite. The ill-posed problems typically form a lower dimensional surface in the space of problems. It turns out that for many problems of numerical analysis, there is a simple relationship between the condition number of a problem and the shortest distance from that problem to the surface of ill-posed ones: the shortest distance is proportional to the reciprocal of the condition number, or bounded by the reciprocal of the condition number. Sometimes, the distance is bounded below by the reciprocal of the condition number squared. This is true for matrix inversion, computing eigenvalues and eigenvectors, finding zeros of polynomials.

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Dettagli dell?edizione

• Editore: Forgotten Books
• Data di pubblicazione: 2018
• ISBN 10: 1334018197
• ISBN 13: 9781334018190
• Rilegatura: Copertina flessibile
• Lingua: Inglese
• Numero di pagine: 66
• Contatto del produttore: non disponibile