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08 February 2025
 
  » arxiv » 1609.0061

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Pixel Arrays: A fast and elementary method for solving nonlinear systems
David I. Spivak ; Magdalen R. C. Dobson ; Sapna Kumari ;
Date 1 Sep 2016
AbstractWe present a new method, called the Pixel Array method, for approximating all solutions in a bounding box, for an arbitrary nonlinear system of relations. In contrast with other solvers, our approach requires the user must specify which variables are to be exposed, and which are to be left latent. The entire solution set is then obtained---in terms of these exposed variables---by performing a series of array multiplications on the $n_i$-dimensional plots of the individual relations $R_i$. This procedure introduces no false negatives and is much faster than Newton-based solvers. The key is the unexposed variables, which Newton methods can make no use of. In fact, we found that with even a single unexposed variable our system was more than 10x faster than Julia’s NLsolve. The basic idea of the pixel array method is quite elementary, and the purpose of this article is to give a complete account of it.
Source arXiv, 1609.0061
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