HowTo's

These HOWTO's describe in details specific operations or procedures that are part of almost every ROOT session or application.They are classified under the known chapters of the User's Guide with which they are related to. Let us know the subjects on which you would like to see other HOWTO's. Do not hesitate to contact us at rootdev@cern.ch

• Getting Started
• Histograms
• Fitting Histograms
• CINT the C++ Interpreter
• Graphics and Graphical User Interface
• Input/Output
• Trees
• Linear Algebra in ROOT
• Adding a Class
• Python and Ruby Interfaces
• Tutorials and Tests
• VMC (Virtual Monte Carlo)
• Writing a Graphical User Interface
• Threads
• Automatic HTML Documentation
• Miscellaneous

Getting Started

• How to Convert HBOOK/PAW Files to ROOT Files?
• How to Use ROOT under Windows NT?
• How to Convert from PAW?

Histograms

• How to Use the Histogram Classes?
• How to Merge Histogram Files?

Fitting Histograms

• How to fit using the FitPanel?
• How to Fit Histograms or Data Points?
• How to Find Peaks in Histograms?
• How to Use ROOT Statistic Classes?

CINT the C++ Interpreter

• How to Understand a Class Structure?
• How to Call CERNLIB Routines from the Interpreter?

Graphics and Graphical User Interface

• How to Draw Objects?
• How to Pick Objects?
• How to Use the Graphics Editor?
• How to Create an Axis with Time Units?
• How to Create or Modify a Style?
• How to Use the PostScript Interface?
• How to define a smooth color palette?
• How to Have Two Different Color Palettes on the Same Canvas?
• How to let graphics primitives respond to a mouse click ?
• How to set ranges on axis ?
• How to embed a canvas in external applications ?

Input/Output

• How to Write Objects to a File?
• How to Read Objects from a File?
• How to Access  ROOT Files Remotely via the rootd server?
• How to Access  ROOT Files Remotely via RFIO?
• How to Read a ROOT File via the Web?
• How to Read a ROOT File via Amazon S3?
• How to Read a ROOT File via Google Storage?

Trees

• How to Create and Fill a Tree?
• How to read a Tree?
• How to Use Chains (List of Files)?

Linear Algebra in ROOT

• How to to Create and Fill a Matrix?
• How to Invert a Matrix?
• How to Perform a Linear Fit?

Adding a Class

• Adding your class to ROOT: ClassDef()
• Creating a dictionary for your class.

Python and Ruby Interfaces

• How to use Use the Python PyROOT Interpreter?
• How to Use the Ruby Interpreter?

Tutorials and Tests

• How to Compile and Link with the ROOT Libraries?

VMC (Virtual Monte Carlo)

• How to Use Virtual Monte Carlo?

Writing a Graphical User Interface

• How to Use the ROOT GUI Classes?
• How to Use the Signal/Slot Communication Mechanism?
• How to Use the ROOT GUI Builder?

Threads

• How to Use the ROOT Thread Classes?

Automatic HTML Documentation

• How to Generate HTML Documentation?

Miscellaneous

• How to Use the FOAM package?
• How to Use Mathematica From ROOT ?