Also, I noticed that the implementation (given in the documentation) of TF1::FixParameter seems to set the upper and lower limits equal using SetParLimits. This would normally correspond to 'constant' in minuit not 'fixed'. If I recall correctly this procedure would not allow me to step a fixed parameter and refit (as in mapping out a likelihood function) as the value after a step would be outside the allowed limits. I guess this could be dodged by using SetParLimits as well as well as SetParameter when making such a step. Art S. ----- Original Message ----- From: "Arthur E. Snyder" <snyder@SLAC.Stanford.EDU> To: "Rene Brun" <brun@pcbrun.cern.ch> Cc: <roottalk@pcroot.cern.ch>; "Arthur E. Snyder" <snyder@MAILBOX.SLAC.Stanford.EDU> Sent: Sunday, December 02, 2001 7:44 PM Subject: Re: [ROOT] Interactive minuit access from ROOT? -FixParameter functionmissing? > Hello Rene, > > I'm trying to use the function TF1::FixParameter(Int_t,Double_t). It does > not seem to be there. I see it in the write up, but when I try to execute it > complains that it does not exist. Also <tab> completion does not find it, > but does find other functions, such as GetParameter. > > ? > > Thanks, Art S. > > ----- Original Message ----- > From: "Rene Brun" <brun@pcbrun.cern.ch> > To: "Arthur E. Snyder" <snyder@SLAC.Stanford.EDU> > Cc: <roottalk@pcroot.cern.ch> > Sent: Sunday, December 02, 2001 2:49 PM > Subject: Re: [ROOT] Interactive minuit access from ROOT? > > > > Art, > > > > Even in PAW, people included the Minuit commands in a KUIP macro. > > You should do the same. However, currently, it is not easy to get > > the control after each iteration. You get the control only at the end > > of the fit, unless you implement your own fitting model (like > > H1FitChisquare or likelihood). One could imagine a new option > > to force a call to a function or macro after each iteration. > > If there are more suggestions, they are welcome. > > > > Rene Brun > > > > On Sun, 2 Dec 2001, Arthur E. Snyder wrote: > > > > > Hi Rene, > > > > > > I was able to grab gMinuit and use mnexcm to execute minuit commands, > refit, > > > etc. It is pretty awkward interactively, but works. However, the results > do > > > not propagate back to the function attached to my histogram, so when I > > > redraw it I see the result of the original default fit. Also, if I refit > it > > > seems to start again from scratch and forget any 'fix' or 'set par' I've > > > done to gMinuit object. > > > > > > Perhaps, I would be better off using the get/set functions provided in > TF1? > > > It looks pretty easy to write my own little macro to manipulate these > > > functions with minimal typing ... > > > > > > Art > > > > > > > > > ----- Original Message ----- > > > From: "Rene Brun" <brun@pcbrun.cern.ch> > > > To: "Arthur E. Snyder" <snyder@SLAC.Stanford.EDU> > > > Cc: <roottalk@pcroot.cern.ch> > > > Sent: Sunday, December 02, 2001 1:39 PM > > > Subject: Re: [ROOT] Interactive minuit access from ROOT? > > > > > > > > > > Use the global gMinuit > > > > > > > > Rene Brun > > > > > > > > On Sun, 2 Dec 2001, Arthur E. Snyder wrote: > > > > > > > > > Thanks, Rene. Can you tell me how I access TMinuit object when I'm > > > fitting a > > > > > histogram? I don't find an assessor either in TF1 or TH1. I've also > > > looked > > > > > up the inheritance tree but don't find anything that looks like the > > > right > > > > > thing. > > > > > > > > > > Art > > > > > > > > > > > > > > > > > > > > ----- Original Message ----- > > > > > From: "Rene Brun" <brun@pcbrun.cern.ch> > > > > > To: "Arthur E. Snyder" <snyder@SLAC.Stanford.EDU> > > > > > Cc: <roottalk@pcroot.cern.ch> > > > > > Sent: Sunday, December 02, 2001 9:49 AM > > > > > Subject: Re: [ROOT] Interactive minuit access from ROOT? > > > > > > > > > > > > > > > > Hi Art, > > > > > > > > > > > > The direct equivalent of PAW option "M" does not exist. > > > > > > However, you can invoke any function from TMinuit directly. > > > > > > This should provide even more flexibility at the expense > > > > > > of slightly more typing. > > > > > > > > > > > > Rene Brun > > > > > > > > > > > > On Sat, 1 Dec 2001, Arthur E. Snyder wrote: > > > > > > > > > > > > > Try again to post this with more sensible subject line! > > > > > > > > > > > > > > ----- Original Message ----- > > > > > > > From: "Arthur E. Snyder" <snyder@SLAC.Stanford.EDU> > > > > > > > To: <roottalk@pcroot.cern.ch> > > > > > > > Sent: Saturday, December 01, 2001 12:29 AM > > > > > > > Subject: Re: [ROOT] tiny Bug in root > > > > > > > > > > > > > > > > > > > > > > Is it possible to invoke interactive minuit from within ROOT? > > > I.e., > > > > > the > > > > > > > > equivalent of 'h/fit 100 myfunc.f m' in paw? The ROOT fit > provides > > > > > most of > > > > > > > > the options of paw, but not this one. The 'm' option in ROOT > seems > > > to > > > > > be > > > > > > > > something different. > > > > > > > > > > > > > > > > I've looked in TMinuit, TF, and TH1 classes, but have not been > > > able to > > > > > > > find > > > > > > > > anyway to get to the interactive interface of minuit or some > > > > > alternative. > > > > > > > > > > > > > > > > Art Snyder at SLAC > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > >
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