[Rivet] Scaling histograms

[Andy Buckley]

Does the --multiply flag to rivet-rescale do what you want? (see
rivet-rescale --help)

If that's not what you need, then probably it's best to access the
histograms programmatically via the "lighthisto" Python module, with
something like

import lighthisto
histodict = lighthisto.Histo.fromAIDA("mydata.aida")
...

To get interface info for lighthisto, call the following at a Python prompt:

>>> import lighthisto
>>> help(lighthisto)

The major objects are the Histo and Bin, for which you can get info with

>>> help(lighthisto.Histo)
>>> help(lighthisto.Bin)

An example usage relevant for you would be

for b in xrange(myhisto.numBins()):
    #print myhisto.getBin(b).val
    myhisto.getBin(b).val *= 0.67

Hope that helps,
Andy


On 05/09/12 18:26, Jennifer Kieselmann wrote:
> Hey all,
> 
> how can I scale histograms with the rivet-rescale only by a constant
> factor? I need to multiply the values by 0.67. From the help I didn't
> really find out how this is possible.
> 
> Can you help me?
> 
> Thanks a lot
> Jennifer
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-- 
Dr Andy Buckley, SUPA Advanced Research Fellow
Particle Physics Expt Group, University of Edinburgh

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