====== ROOT ======
This page collects general ROOT hints. For LHCb specific info see [[root:LHCbROOT]].

=== Finding Help ===
If you are looking for an example containing some specific class (**TObjArray** below). ''grep'' for it in the tutorial directory:
<code>
cd $ROOTSYS/tutorials/
grep -r TObjArray *
</code>

===== Setup & Running =====
  * [[root:splash | Splash Screen]] - Get rid of the splash screen
  * [[root:rootlogonscript | ROOT logon script]] - How to write a simple script that does useful things when you logon to ROOT.
  * [[root:batchmode | How to run ROOT in batch mode]] 

===== General =====
  * [[root:chain | How to use a chain ]] - How to use chains in ROOT. 
  * [[root:findBin | Find the bin the value corresponds to]]
  * [[root:loadText | Read data from text file]] - Read the columns of a text file into a root tree.
  * [[root:savePlot | Save a plot to a file]]
  * [[root:Strings | String manipulation]] - Tips and Tricks for working with strings.

  * pyRoot: [[root:pythonRootConstructors | Constructors]] - How to use a ROOT constructor with pointers as arguments?
  * pyRoot: [[root:python | Passing Lists to TGraph]]
  * pyRoot: [[root:pyrootPassRef | Pass by reference]]
  * pyRoot: [[root:ownershipPyRoot | Ownership in PyROOT ]] - Or how not to loose your canvases.
  * pyRoot: [[root:componentsPyRootRooFit | Drawing components of pdfs in RooFit]] - How to draw components of pdf ins RooFit with PyRoot.
  * pyRoot: [[root:pyrootGetEvent | Accessing events in a tree]]
===== Plotting =====
  * [[root:functionsetnumberpoints | Set the number of points to draw a function]]
  * THStack: [[root:thstack |using and troubleshooting THStack]]
  * [[root:ttreedraw | TTree::Draw]] - Tips, Tricks and Pitfalls
===== Configure Display =====
  * Axis: [[root:setAxisRange | Set the display range of your axis]]
  * Axis: [[root:numberOfDivisions | Set the number of divsions of an axis]] 
  * Axis: [[root:labelsTitle | Configure labels and title]]
  * Axis: [[root:logScale | Set log scale for an axis]]
  * Axis: [[root:redrawAxis | Redraw Axis to get ticks on top]]
  * Axis: [[root:binsOrder | What does "Bins must be in increasing order mean?"]]
  * Axis: [[root:PaletteAxis | How to format 'Colour Axis' in root]]
  * Marker: [[root:changeMarkerStyle | Change marker style]]
  * Legend: [[root:addLegend | Adding a legend]] 
  * Pads: [[root:style | Change Style of Canvas/Pad]] - Get rid of grey background and ugly borders.
  * Pads: [[root:padMargins | Change the Margins of a pad]]
  * Pads: [[root:padLayouts | Pad Layouts]] - Examples of special Layouts
  * StatBox: [[root:Two stats boxes | Draw two stats boxes]] - How to overlay histograms and draw both stats boxes.
  * StatBox: [[root:noStats | No StatBoxes]] - Deactivate StatBoxes globally.
  * [[root:showCuts | Show cut values as lines or areas]]
  * [[root:colorscheme | Improve the color scheme]] - How to have a nice color scheme


 

===== Special Cases ===== 
  * [[root:troubleshooting | Root-files ]] - Troubles with root files (e.g. empty files)
  * [[root:nanfinite | Treatment of non-real numbers / infinity]] - How to catch infinite and imaginary numbers.


===== RooFit ===== 
  * [[root:roofittut01 | An easy start to RooFit]] - Learning the basics about RooFit
  * [[root:controlOutputRooFit | How verbose should RooFit be]]
  * [[root:customPdfsAndWorkspace | Custom pdfs and workspace ]] - Or how to avoid possible trouble...