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Given your example function: f(x) = 3*(x-4)*(x-4)+2 = 3*x^2 - 24*x + 50 We can define a funciton f*(v) = 3*v^4 - 24*v^2 + 50 = f(v^2) The minimum positive value for f(x) is then arg(min(f*(v)))^2, which, per definition, is always postive for real values of v. On Tue, 2003-07-29 at 12:12, Przemyslaw.Sliwa@ecb.int wrote: > Could you give me any example??? > I do not have any idea how to proceed with it. > > Thanks, > > Przem > > > > Hello, > > a good idea is to make a change of variable in such a way that > the new variable are unconstrained. > > I hope that helps, > Jerome > > Sang-Joon Lee wrote: > Hi, > > In using the GSL "Multidimensional Minimization" algorithms, I would > like > to limit the range of variables. For instance, in a function, > f(x)=3*(x-4)*(x-4)+2, I would like to make x be a positive real > number. > I would appreciate if you let me know how to do this. > > Sincerely yours, > > Sang-Joon Lee > > > > > > Any e-mail message from the European Central Bank (ECB) is sent in good faith but shall neither be binding nor construed as constituting a commitment by the ECB except where provided for in a written agreement. > This e-mail is intended only for the use of the recipient(s) named above. Any unauthorised disclosure, use or dissemination, either in whole or in part, is prohibited. > If you have received this e-mail in error, please notify the sender immediately via e-mail and delete this e-mail from your system. >
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