Method to plot many TGraphs from different .root files

[Wile_E_Coyote]

Aux;1 aux;2 aux3;

Search for “cycle” and/or “namecycle”, for example in: In a Nutshell: Input and Output . ROOT User’s Guide: Input/Output : Retrieving Objects from Disk , Subdirectories and Navigation . Just for reference: some additional notes about GetObject, Get, FindObjectAny, FindKeyAny, ReadObj, ReadObjAny .

Broken TDirectoryFile::FindObjectAny and TDirectoryFile::FindKeyAny

Although it is not recommended, I saw many cases in which people store, in a single file, many histograms (or graphs, or even some “event” objects) which have the same “name”, but they differ in the “cycle” number (I did it myself, too). Each histogram (or graph) keeps a “sub-sample” of data. In the end, you may need to analyze/compare different “sub-samples”, or you may want to add them all (to get the “total result”). One may argue that, in such cases, one should create a TTree with a branch…