Kalanand's November 2009 Log

October 2009

December 2009

November 13th

Editing Twiki files in Emacs

Charles Plager has found a way to edit CERN twiki files in emacs instead of the web browser.
Unfortunately, his recipe works for Windows machnies only :(

See details here. http://home.fnal.gov/~cplager/log/0911/log.html#091113_Editing_Twikis_in_Emacs

November 20th

How to replace special chars like " ' " (Apostrophe) in sed/awk

I have a file called "aaa.txt" with the following content:

... kalanand ' ' ' ' ' ' ' oli  ''''' ''''  Dave    '''''''''' jim

When I try,

   sed s/"'"/" "/g aaa.txt

I get:

 ... kalanand               oli              Dave               jim

The syntax is:

 sed s/  / /g

Here the option "/s" tells the sed command to replace a string, and the option "/g" tells it to make the replacement globally, i.e., everywhere in the file.

November 23rd

Dijet mass ratio (central jets/ forward jets)

hc = tfile.Get("CentralDijetMass")
hf = tfile.Get("ForwardDijetMass")


hc.Divide(hf)
hc.GetXaxis().SetRangeUser(453.0,2332.0)
hc.GetYaxis().SetRangeUser(0.0,1.0)
cname = "ratio"
canv = ROOT.TCanvas(cname,cname,400,400)
hc.Draw()
canv.SaveAs(outdir+canv.GetName()+".eps")
canv.SaveAs(outdir+canv.GetName()+".gif")

November 27th

Skim a few data events for display in Fireworks

import FWCore.ParameterSet.Config as cms
process = cms.Process("PICKEVENTS")

process.source = cms.Source ("PoolSource",
                                     fileNames = cms.untracked.vstring(
    'file:mydatafile.root'
    ),
    eventsToProcess = cms.untracked.VEventRange('140331:384695957') #run:event
  )

process.Out = cms.OutputModule("PoolOutputModule",
                               outputCommands = cms.untracked.vstring('keep *'),
                               fileName = cms.untracked.string('select.root')
                               )

process.e = cms.EndPath(process.Out)
process.maxEvents = cms.untracked.PSet( input = cms.untracked.int32(-1) )

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Last modified: Tue Nov 27 19:47:58 CST 2009