the only way to recognize the old versions is to test the file version in Streamer.
This change is necessary to real old canvases in Root files generated
before version 2.24/05.


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of the list. The mod is in the Enter function.


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linked against all available libraries AND to make sure to rename
the loaded library from .dll (the loaded part) in .lib (the linker
part).  He has removed any path from the library name (the
NT linker accept only direct path or filename in one of the LIBPATH
directory, no blend of the two is possible (to access subdirectory of
directory listed in LIBPATH for example)).
Last there a few problem arising for the fact that NT uses '\' as a
directory separator.  In particular, he had to work around the fact
that the ROOT regular expression used '\' as a special character
AND the fact that cint stores some filenames as 'g:\mydir\myfile.C' rather
than 'g:\\mydir\\myfile.C'.  So instead on relying mainly o regular
expressions, the new (and very good) cint filename matching algorithm
is used.


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* 1366, enum scoping for inherited class declaration, t437.cxx
* 1367, explicit type conversion in the same class member function, t439.cxx
* 1368, precompiled/interpreted class inheritance message change


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automatically generated by TTree::MakeSelector.
The file h1anal.C has plenty of comments explaining the principle
and the various ways to run this class.
The data sets used by this tutorial have been copied to the Root Web site.
For the location and use, see the fiel h1anal.C


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TPrincipal.
The user interface is in TTree::Principal that calls the TTreePlayer::Principal
function. The specs of this interface are:
TPrincipal *TTree::Principal(const char *varexp, const char *selection, Option_t *option, Int_t nentries, Int_t firstentry)
{
//*-*-*-*-*-*-*-*-*Interface to the Principal Components Analysis class*-*-*
//*-*              ====================================================
//
//   Create an instance of TPrincipal
//   Fill it with the selected variables
//   if option "n" is specified, the TPrincipal object is filled with
//                 normalized variables.
//   If option "p" is specified, compute the principal components
//   If option "p" and "d" print results of analysis
//   If option "p" and "h" generate standard histograms
//   If option "p" and "c" generate code of conversion functions
//   return a pointer to the TPrincipal object. It is the user responsability
//   to delete this object.
//   The option default value is "np"
//
//   see TTree::Draw for explanation of the other parameters.
//
//   The created object is  named "principal" and a reference to it
//   is added to the list of specials Root objects.
//   you can retrieve a pointer to the created object via:
//      TPrincipal *principal =
//        (TPrincipal*)gROOT->GetListOfSpecials()->FindObject("principal");
//


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In the constructor, the TPrincipal object, named "principal" by default
is automatically added the gROOT->GetListOfSpecials().


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side effects. A simple session opening a root file will crash when
the TROOT destructor is called. This line recommented.


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must be cast to a void explicitly in the TF1 constructor:
   char *funcname = G__p2f2funcname((void*)fcn);


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   SafeDelete(fInterpreter);
This sattement was disabled because of a crash in CINT destructors.
This problem seems to be fixed with teh new version of CINT.
The reason for activating it, is that cint opens files (like bool.h) that
it closes only when explicitly told (by scratch_all and G__close_inputfiles).
Currently neither is being called at  the end of a ROOT process so a few
files are left open


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of the convention used for font types, size and quality.


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must be taken into account.


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function from an interpreted code.


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I have source of ROOT 2.23 and made a small fix in META_Class.cxx
line 270

OLD   if(realDataObject != gROOT) {

NEW   if(realDataObject && realDataObject != gROOT) {

This prevents browser segv when you click on class name.


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Replace the name of the static variables in the generated code by
names starting by g rather thab fg


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being they not used in ProcessLine() yet.


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  Char_t* prefix   = (isMethod ? Form("%s::", classname) : "");
  Char_t* cv_qual  = (isMethod ? "" : "static ");
by
  const Char_t* prefix   = (isMethod ? Form("%s::", classname) : "");
  const Char_t* cv_qual  = (isMethod ? "" : "static ");


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The Sun compiler was complaining.


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errors or warnings on some machines.
These functions are empty for the time being.


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#include <fstream>
#include <iostream>
#include <iomanip>
by
#include <fstream.h>
#include <iostream.h>
#include <iomanip.h>


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the dimension was not a constant expression.


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errors or warnings on some machines.
These functions are empty for the time being.


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The Principal Components Analysis class
=======================================
In many applications of various fields of research, the treatment of
large amounts of data requires powerful techniques capable of rapid
data reduction and analysis. Usually, the quantities most
conveniently measured by the experimentalist, are not necessarily the
most significant for classification and analysis of the data. It is
then useful to have a way of selecting an optimal set of variables
necessary for the recognition process and reducing the dimensionality
of the problem, resulting in an easier classification procedure.

TPrincipal is the implementation of one such method of
feature selection, namely the principal components analysis.
This multidimensional technique is well known in the field of pattern
recognition and and its use in Particle Physics has been documented
elsewhere (cf. H. Wind, <I>Function Parameterization</I>, CERN
72-21).


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the changes in THistpainter::paintContour.


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