[Rivet] Converting from ROOT to yoda

[Andy Buckley]

Correct, we got rid of that one because the "flat" format is really only 
intended for data browsing convenience rather than as a robust exchange 
format.

(For that same reason I'm very tempted to deprecate the two flat2* 
functions that YODA does provide, and get rid of them in version 1.7.0. 
Dammit, yes I'm going to do that ;-) )

Andy



On 14/07/16 19:16, Salvatore Rappoccio wrote:
> Thanks Andy,
>
> So just to completely clarify, we should not use the "root2flat" macro
> anymore?
>
> Cheers,
> Sal
>
>
> On Wed, Jul 13, 2016 at 5:15 PM, Andy Buckley <andy.buckley at cern.ch
> <mailto:andy.buckley at cern.ch>> wrote:
>
>     Hi Sal & David,
>
>     These scripts are maintained! But they are in YODA rather than
>     Rivet... and those Rivet releases you're looking at are *really*
>     old, Sal.
>
>     If you get hold of a recent version of YODA, built with ROOT support
>     (give --enable-root to the configure script and make sure
>     root-config is available), then root2yoda will be installed and
>     should work fine.
>
>     Otherwise feel free to write your own PyROOT/YODA script: that's all
>     that root2yoda is!
>     https://yoda.hepforge.org/hg/yoda/file/tip/bin/root2yoda  (Note that
>     the fiddly bit is the ROOT tree walking, which we've abstracted into
>     the yoda.root submodule)
>
>     And yes, the "flat" format is not designed for robust storage -- I
>     didn't know but am not really surprised that it falls over on flat
>     files written/read between Rivet versions 1 and 2.
>
>     Andy
>
>
>
>     On 13/07/16 21:57, David Bjergaard wrote:
>
>         Hi Sal,
>
>         (Remember me!?) Andy and other devs can advise you better, but
>         to my knowledge
>         the way to do this would be with YODA's python interface and
>         PyROOT.  Loop over
>         the TH1s and populate the YODA histogram appropriately.  I don't
>         know how
>         complicated your root file structure is, but you could make it
>         as fancy (or
>         simple) as needed. ("less `which make-plots`" to get a decent
>         tutorial on how the
>         yoda interface works, and PyROOT is its own beast)
>
>         Python docs are here: http://yoda.hepforge.org/pydoc/ I'm pretty
>         sure the x2yoda
>         and yoda2x scripts are not being maintained, but again the
>         authorities know better.
>
>         I don't think there is a "off the shelf" solution since the
>         whole Rivet stack is
>         intended to stand separately from ROOT.
>
>               David
>
>
>         Salvatore Rappoccio <rappoccio at gmail.com
>         <mailto:rappoccio at gmail.com>> writes:
>
>             Hi, Andy, All,
>
>             I am trying to convert a file full of histograms from ROOT
>             to yoda. I
>             tried to do "root2flat" and then "flat2yoda". I got
>             "root2flat" from
>             here:
>
>             http://rivet.hepforge.org/svn/tags/rivet-1.6.0/bin/root2flat
>
>             I didn't see any root2flat in this SVN area :
>
>             http://rivet.hepforge.org/svn/tags/rivet-2.0.0b1/bin/
>
>             Then tried "flat2yoda" but it looks like the schema for the data
>             format is not backwards compatible, I get:
>
>             cmslpc32:$ flat2yoda CMS_SMP_16_010_data_ptbin0.dat
>             Traceback (most recent call last):
>             File
>             "/cvmfs/cms.cern.ch/slc6_amd64_gcc530/cms/cmssw/CMSSW_8_0_10/external/slc6_amd64_gcc530/bin/flat2yoda
>             <http://cms.cern.ch/slc6_amd64_gcc530/cms/cmssw/CMSSW_8_0_10/external/slc6_amd64_gcc530/bin/flat2yoda>",
>             line 25, in <module>
>             analysisobjects = yoda.readFLAT(i)
>             File "yoda/include/IO.pyx", line 150, in yoda.core.readFLAT
>             (yoda/core.cpp:72398)
>             yoda.ReadError: Unexpected line in YODA format parsing when
>             BEGIN
>             expected
>
>             Any ideas? What should I do here? Where are the most up to date
>             instructions?
>
>             Cheers,
>             Sal
>
>
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>
>
>     --
>     Dr Andy Buckley, Lecturer / Royal Society University Research Fellow
>     Particle Physics Expt Group, University of Glasgow
>
>


-- 
Dr Andy Buckley, Lecturer / Royal Society University Research Fellow
Particle Physics Expt Group, University of Glasgow