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From: Yu Li on 11 Jun 2010 18:03
In my previous post, I used fsolve. It seems that sometime the root converges to negative values, which do not make physical sense in the problem I am working on. So if I constraint the roots to be positive, does this mean that I have to use fmincon instead of fsolve? Thanks a lot
From: Steven Lord on 14 Jun 2010 11:38

"Yu Li" <yuliyy(a)gmail.com> wrote in message
news:huubqo$4ah$1(a)fred.mathworks.com...
> In my previous post, I used fsolve. It seems that sometime the root
> converges to negative values, which do not make physical sense in the
> problem I am working on. So if I constraint the roots to be positive, does
> this mean that I have to use fmincon instead of fsolve? Thanks a lot

You could try starting FSOLVE from a different initial guess (or several
initial guesses.)

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Steve Lord
slord(a)mathworks.com
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