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We discuss the CERN's ROOT library as a histogramming tool for PSANA project.

Objectives

In PSANA framework we need in package which allows to accumulate data in form of histograms and tuples and save them in file for further analysis. An official package which performs this job is PSHist. PSHist provides an abstract interface to the selected set of methods. Actual implementation of these methods is provided in the RootHist package, which is based on CERN's ROOT library. In case if user would need in full brute force of ROOT, we could suggest to use it directly. In this note we present only the basic interface, equivalent to the PSHist, which allows to accumulate data save the file and browse this file interactively in ROOT. Complete documentation for ROOT library can be found here.

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