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用 PHCpack 和 phcpy 外推多项式同伦解路径至奇异点

Extrapolating Solution Paths of Polynomial Homotopies towards Singularities with PHCpack and phcpy

Jan Verschelde, Kylash Viswanathan

AI总结:

本文扩展了 PHCpack/phcpy 的路径跟踪功能,引入逐步跟踪器并研究外推方法,以在多项式同伦延拓中准确定位解路径末端的奇异点。

摘要:

PHCpack 是一个用于多项式同伦延拓的软件包,它提供了一个稳健的路径跟踪器 [Telen, Van Barel, Verschelde, SISC 2020]。该跟踪器计算牛顿法的收敛半径,估计到最近路径的距离,然后应用 Padé 逼近来预测路径上的下一个点。先验步长控制比后验步长控制对精细调节的容差更不敏感,因此具有稳健性。Python 接口 phcpy 通过一个新的逐步跟踪器进行了扩展,并被应用于外推方法的实验,以准确定位解路径末端的奇异点。

英文摘要:

PHCpack is a software package for polynomial homotopy continuation, which provides a robust path tracker [Telen, Van Barel, Verschelde, SISC 2020]. This tracker computes the radius of convergence of Newton's method, estimates the distance to the nearest path, and then applies Padé approximants to predict the next point on the path. A priori step size control is less sensitive to finely tuned tolerances than a posteriori step size control, and is therefore robust. The Python interface phcpy is extended with a new step-by-step tracker and is applied to experiment with extrapolation methods to accurately locate the singular points at the end of solution paths.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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