[Rivet] Converting from ROOT to yoda

[Salvatore Rappoccio]

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> 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> 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
>>> ",
>>> 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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>>> Rivet at projects.hepforge.org
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>>>
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>>
>
> --
> Dr Andy Buckley, Lecturer / Royal Society University Research Fellow
> Particle Physics Expt Group, University of Glasgow
>
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