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Topic: Avoid a certain solution w fzero
Replies: 4   Last Post: Feb 21, 2013 10:12 AM

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Registered: 11/8/10
Re: Avoid a certain solution w fzero
Posted: Feb 21, 2013 9:33 AM
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"Matt beach" <> wrote in message <kg59cu$dpc$>...
> actually, my function isn't a polynominal. It has arctan's, sqrt's, and sine's

Divide your function f(x) by x^n where n is the multiplicity of the zero at x=0.
Then the new function g(x)=f(x)/x^n is different from 0 at x=0, but all other roots remain unchanged.
f(x)=x^2*(x-4) has a zero of multiplicity 2 at x=0.
Dividing by x^2, you get g(x)=x-4.
f(x) and g(x) both share the third root x=4.

Best wishes

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