Thanks for the suggestions. I have started using R just a few days back. So i thought I might be missing something and its better to clarify. I was actually looking for a direct command(like fmincon in Matlab or NMinimize in Mathematica) which can solve non linear problems straightaway (quadratically constrained problem in my case).
I tried searching more but coudn't find any such direct command.

Thanks
Amit

----- Original Message ----
From: Spencer Graves <spencer.graves@pdf.com>
To: Prof Brian Ripley <ripley@stats.ox.ac.uk>
Cc: r-help@stat.math.ethz.ch; Martin Maechler <maechler@stat.math.ethz.ch>
Sent: Saturday, December 2, 2006 1:19:06 PM
Subject: Re: [R] Quadratic Optimization

Hi, Prof. Ripley: 

<snip>

>
> But that is a single equality quadratic constraint, and I believe 
> 'quadratic constraints' (note, plural) conventionally means multiple 
> inequality constraints.  That meaning is a hard problem that needs 
> specialized software (most likely using interior-point methods).
>
>>    SpG>       Maximize a'x subject to x'Ax=c.
>
> Not I believe the usual meaning (nor what Googling 'quadratic 
> constraints' came up with for me).
>
Thanks for the clarification.  Spencer Graves

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