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# ANNI - solver of a set of non-linear equations

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Let us suppose a set of non-linear equations in the form
F(m) = d
(m,d are vectors, F is a vector function of vector argument). ANNI tries to construct suitable numerical approximation for inverse projection of d to m, i.e. to find numerical form of
G(d) = m.
Such mapping may not exist in general, and therefore ANNI constructs data/model subspaces covered by population of individuals, for which the inverse G hopefully does exist at least locally. Size and shape of the population are determined adaptively by using empirical rules during the inversion. Numerical approximation of G is achieved by (i) linear regression, (ii) linear prediction ('Kriging') and, (iii) radial basis function network.
ANNI is designed with respect to minimize the number of function evaluations. All computed individuals are stored in the internal data structure and are reused multiple times. Derivatives are not necessary, since in practice they are usually accessible in the form of differences only.
ANNI can be used for problems commonly solved by standard MATLAB function fsolve. ANNI is nearly as efficient as fsolve for simple problems, but it seems to be more robust for difficult problems when fsolve fails. ANNI can search for multiple roots of non-unique problems (fsolve cannot).
Rigorous description of ANNI algorithm is available in the attached pdf document.

Free download from Shareware Connection - Let us suppose a set of non-linear equations in the form F(m) = d (m,d are vectors, F is a vector function of vector argument). ANNI tries to construct suitable numerical approximation for inverse projection of d to m, i.e.

Publisher: Bohuslav Ruzek | License: Shareware
Version: 1.0 | Size: 276 KB | Platform: Matlab, Scripts
Released Date: 24-06-2013 | Rating: 0 | Title: ANNI - solver of a set of non-linear equations

Author Url: http://www.mathworks.com
Program Info Url: http://www.mathworks.com

ANNI - solver of a set of non-linear equations keywords:

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