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## Re: Nonlinear equation

**From**: |
Lorenzo Fiorentini |

**Subject**: |
Re: Nonlinear equation |

**Date**: |
Fri, 18 Apr 2003 10:35:09 +0200 |

Of course fsolve works without need of a derivative function;
this simply means that it does not implement, strictly
speaking, the Newton's method, which by definition needs it.
As far as I can see here:
http://sunsite.univie.ac.at/textbooks/octave/octave_19.html
http://www.math.utah.edu/software/minpack/minpack/hybrd.html
fsolve uses a Powell hybrid method which relies on a finite
difference estimation for calculating a numerical jacobian.
Lorenzo
Il 16/04/2003 14.42.00, Heber Farnsworth
<address@hidden> ha scritto:
>*I think you may be confused. Fsolve implements Newton's *
method (with a
>*dogleg search as I recall) and it does not need you to *
calculate an
>*analytic derivative.*
>
>*Heber*
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