Minuit++ URD

From: Nick van Eijndhoven (Nick@fys.ruu.nl)
Date: Mon Oct 20 1997 - 16:32:39 MEST


Dear Jamie,
Unfortunately I can't be present at the Minuit++ URD discussion 23-oct-1997.
However, I had a look at the document of Zbyszek in trying to figure
quickly out how I (in doing my physics analysis) could easily try out
several different fits through my data points or distribution.
I was not able (being a simple physicist) to get that from the URD.ps file;
it looks too much as some writeup promising lots of things in future
too me without telling what real functionality one can expect from it
in doing the real (=physics analysis) work.
So as input to the discussion I just can tell you here what functionality
I would like to have.
First of all : please make the documents available via some central
WWW homepage, since from outside CERN going to some /afs directory
to ftp the .ps file is a pain in the ass.

1) Having some data points or some distribution I would like to view
   the data in a plot first.

2) Now I would like to 'click' at the plot and obtain a menu from which 
   I could select e.g. FIT.

3) Then a second menu should pop up in which I can select the boundaries
   of the fit and the fitting function (either some standard ones like
   Polynomial, Gaussian etc... or "user function")

4) Having selected a certain function I should be able to provide 
   additional info (e.g. order of polynomial) or just provide the C++
   code for a user function.

5) Clicking eventually on the "OK" button should perform the fit and
   show me the fit curve + parameter values in the same plot as
   my data points.

6) Clearly I would like to repeat steps 2)-5) to try out several functions,
   boundaries etc....

Bottom line : I want to get completely rid of this hastle of providing
              a FCN function as it was in the old FORTRAN case.

However, the possibility of 'doing it the old way' (but then in C++)
should still be there.

The above is based on my experience in performing my complete WA93 direct
photon analysis in C++ (using the ROOT framework) and it turned out that 
having these tools available has saved me a lot of time !

                                                    Cheers,
                                                     Nick.

*----------------------------------------------------------------------*
 Dr. Nick van Eijndhoven                Department of Subatomic Physics
 email : nick@fys.ruu.nl                Utrecht University / NIKHEF
 tel. +31-30-2532331 (direct)           P.O. Box 80.000
 tel. +31-30-2531492 (secr.)            NL-3508 TA Utrecht
 fax. +31-30-2518689                    The Netherlands
 WWW : http://www.fys.ruu.nl/~nick      Office : Ornstein lab. 172
 ----------------------------------------------------------------------
 tel. +41-22-7679751 (direct)           CERN PPE Division / ALICE exp.
 tel. +41-22-7675857 (secr.)            CH-1211 Geneva 23
 fax. +41-22-7679480                    Switzerland
 CERN beep : 13+7294                    Office : B 160 1-012
*----------------------------------------------------------------------*



This archive was generated by hypermail 2b29 : Tue Jan 04 2000 - 00:26:21 MET