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MathGroup Archive 1995

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Re: FindMinimum [] more elegantly?

  • To: mathgroup at christensen.cybernetics.net
  • Subject: [mg1630] Re: FindMinimum [] more elegantly?
  • From: pehowland at taz.dra.hmg.gb (Paul E. Howland)
  • Date: Fri, 7 Jul 1995 01:03:07 -0400
  • Organization: Defence Research Agency

In article <3sisqj$n9u at news0.cybernetics.net>, MAMER at utkvx.utk.edu writes:

>I have a question regarding putting the FindMinimum[] into a more elegant
>form than the following which I've been using.
>I have a function sumOfSquares of two variables a and b and I need to feed
>back the values of a and b into the FindMinimum expression as follows:
>alpha= 0.234; beta= .567;
>FindMinimum[ sumOfSquares, {a,alpha}, {b,beta}, MaxIterations->100 ]
>alpha= a/.%[[2,1]] ; beta=b/. %[[2,2]];
>
>I used the to click on the last two statements several times til the output
>of FindMinimum stabilizes. Is there an elegant way to do this?

Yes.  Just increase MaxIterations to a larger value, or alter the value of
AccuracyGoal or PrecisionGoal.  Restarting FindMinimum with a closer starting
point is no different from letting it continue processing from that point.

Paul E Howland                         

Long Range Ground Radar Systems Section               tel. +44 (0)1684 895767
LSC2 Division, Room BY209                             fax. +44 (0)1684 896315
Defence Research Agency                           email: PEHOWLAND at DRA.HMG.GB 
Malvern, Worcs, WR14 3PS, UK.                      
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