Merge branch 'NPTool.2.dev' of https://gitlab.in2p3.fr/np/nptool into NPTool.2.dev

Projects/AlPhaPha/DataMacro/Merger.C

+void Merger(int N, const char* outputDir, const char* outputFileName, const char* inputBaseName) {
+    TString outputPath = Form("%s/%s", outputDir, outputFileName);
+    TFile *outputFile = new TFile(outputPath, "RECREATE");
+    TList *fileList = new TList();
+
+    for (int i = 0; i < N; i++) {
+        TString fileName = Form("%s%d.root", inputBaseName, i); // Base name + index + .root
+        TFile *inputFile = TFile::Open(fileName);
+        if (!inputFile || inputFile->IsZombie()) {
+            std::cerr << "Error opening file: " << fileName << std::endl;
+            continue;
+        }
+        fileList->Add(inputFile);
+
+        // Display progress
+        int progress = ((i + 1) * 100) / N;
+        std::cout << "\rMerging files: " << progress << "% complete." << std::flush;
+    }
+
+    TFileMerger merger;
+    merger.OutputFile(outputFile, "RECREATE");
+    merger.Merge(fileList);
+
+    std::cout << std::endl << "Merging completed! Output saved at: " << outputPath << std::endl;
+    outputFile->Close();
+}
+

Projects/AlPhaPha/DataMacro/ReadMe.md

+# Macro to handle data analysis
+## Secator
+This macro subdivide a root file into N subfile with the same number of
+entries.
+This is useful if you want to parallelize your analysis.
+## Merger
+Do the opposite of secator.
+
+# DONT FORGET TO CREATE AN OUTPUT DIR IN THIS DIRECTORY

Projects/AlPhaPha/DataMacro/Secator.C

+#include <iostream>
+
+void Secator(const char* inputFileName, const char* outputDir, int N) {
+    // Open the original ROOT file
+    TFile* inputFile = TFile::Open(inputFileName, "READ");
+    if (!inputFile || inputFile->IsZombie()) {
+        printf("Error: Cannot open file %s\n", inputFileName);
+        return;
+    }
+
+    // Extract the base name of the input file (without path and extension)
+    TString baseName = gSystem->BaseName(inputFileName);
+    baseName.ReplaceAll(".root", "");  // Remove the .root extension
+
+    // Ensure the output directory ends with a '/'
+    TString outputDirStr = outputDir;
+    if (!outputDirStr.EndsWith("/")) {
+        outputDirStr.Append("/");
+    }
+
+    // Get the tree from the file
+    TTree* inputTree = (TTree*)inputFile->Get("RawTree"); // replace with actual tree name
+    Long64_t totalEntries = inputTree->GetEntries();
+
+    // Calculate entries per subfile
+    Long64_t entriesPerFile = totalEntries / N;
+
+    // Loop to create N subfiles
+    for (int i = 0; i < N; ++i) {
+        // Create output file name by appending a number to the base name
+        TString outputFileName = TString::Format("%s%s_%d.root", outputDirStr.Data(), baseName.Data(), i);
+        TFile* outputFile = TFile::Open(outputFileName, "RECREATE");
+
+        // Create a clone of the tree in the new file
+        TTree* outputTree = inputTree->CloneTree(0);
+
+        // Write the appropriate entries to the subfile
+        Long64_t start = i * entriesPerFile;
+        Long64_t end = (i == N - 1) ? totalEntries : start + entriesPerFile;
+
+        for (Long64_t entry = start; entry < end; ++entry) {
+            inputTree->GetEntry(entry);
+            outputTree->Fill();
+
+            // Progress bar update
+            float progress = (float)(entry - start + 1) / (end - start) * 100;
+            printf("\rProcessing subfile %d: [%.2f%%]", i + 1, progress);
+            fflush(stdout); // Ensure immediate print
+        }
+
+        printf("\n");  // Newline after progress bar completion for this subfile
+
+        // Write and close the subfile
+        outputTree->Write();
+        outputFile->Close();
+        delete outputFile;
+    }
+
+    inputFile->Close();
+    delete inputFile;
+}
+