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Newton-Raphson Iterative Solver for Systems of Equations


John Fuller (view profile)


09 May 2010 (Updated )

An N-R iterative root-finder for systems of N equations and N unknowns.

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For those of us who like to provide our own partial derivative sensitivity matrix. Can be used for both linear and non-linear systems.

x = nrsolve( F, dFdx, xi, tol, max_iter, c1, c2.... )

Given a system of equations F = {F1;F2;...}, defined sensitivity matrix dFdx (matlab functions allowed), and initial guess vector xi, nrsolve provides a solution vector x. Optional input constants c1, c2, etc. allow for passing variables into functions within F and dFdx.

See testnrsolve for more details.

Comments and debugging are highly appreciated.

MATLAB release MATLAB 7.9 (R2009b)
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Comments and Ratings (2)
20 Oct 2011 John Fuller

John Fuller (view profile)

No humor with this one :)

Comment only
12 Oct 2011 Andrew Knyazev

Incomplete description. The function is hard-coded for no more than 8 equations. Quoting the code: "Holy crap! More than 8 equations to solve??"

01 Dec 2011

Fixed bug with fprintf function upon maximum iterations reached.

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