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From: Vyjayanthi A on 17 Mar 2010 17:21
Hi,

I am using fsolve to find the roots of the cubic equation.
I get results for almost 3/4th of thecalculations but for the last values I get the below error.
??? Error using ==> fzero at 334
Function value at starting guess must be finite and real.

How can I stop this error.
Is there any function so that it can give me the same root(values) for the last calculations.

Can any one please help me.

Thank you
From: Matt J on 17 Mar 2010 17:55
"Vyjayanthi A" <vinzav(a)gmail.com> wrote in message <hnrfv3$nd2$1(a)fred.mathworks.com>...
> Hi,
>
> I am using fsolve to find the roots of the cubic equation.
===================

You mean the roots of a cubic polynomial? If so, consider using roots()

> I get results for almost 3/4th of thecalculations but for the last values I get the below error.
> ??? Error using ==> fzero at 334
> Function value at starting guess must be finite and real.
>
> How can I stop this error.
===============

By giving a starting guess x0 where f(x0) is finite and real.
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