[R] Solving 100th order equation

[Prof Brian Ripley]

See ?polyroot.

However, the numerical stability for such a high-order problem is almost 
certainly a serious issue.

On Sat, 24 May 2008, Shubha Vishwanath Karanth wrote:

> To apply uniroot I don't even know the interval values... Does numerical 
> methods help me? Or any other method?
>
> Thanks and Regards,
> Shubha
>
> -----Original Message-----
> From: Duncan Murdoch [mailto:murdoch at stats.uwo.ca]
> Sent: Saturday, May 24, 2008 5:08 PM
> To: Shubha Vishwanath Karanth
> Subject: Re: [R] Solving 100th order equation
>
> Shubha Vishwanath Karanth wrote:
>> Hi R,
>>
>> I have a 100th order equation for which I need to solve the value for 
>> x. Is there a package to do this?
>>
>> For example my equation is:
>>
>> (x^100 )- (2*x^99) +(10*x^50)+.............. +(6*x ) = 4000
>>
>> I have only one unknown value and that is x. How do I solve for this?

> uniroot() will find one root.  If you want all of them, I don't know
> what is available.
>
> Duncan Murdoch
>>
>>
>> BR, Shubha
>>
>> Shubha Karanth | Amba Research
>>
>> Ph +91 80 3980 8031 | Mob +91 94 4886 4510
>>
>> Bangalore * Colombo * London * New York * San José * Singapore * www.ambaresearch.com

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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