Hi Avdhesh, I assume that you want to use the tutorial in $ROOTSYS/tutorials/hadd.C. This tutorial is intended to be compiled and linked as a program. I suggest to use the macro $ROOTSYS/tutorials/hadd_old.C instead and do: root > .L hadd.old.C (edit the file with your file names) root > hadd() The current macro in $ROOTSYS/tutorials/hadd.C was misplaced in the tutorials. In the development version in CVS, I have now added a new program in main/src/hadd.cxx. When installing ROOT, the corresponding executable module is generated in $ROOTSYS/bin/hadd. People taking the new versions of the binaries (3.03/02) to be generated today or tomorrow will have this new module automatically. If you install from the current CVS source, it is already there. Rene Brun Avdhesh Chandra wrote: > > Hi !! > > I have two root-tuole(say file1.root and file2.root) containg only 1D and > 2D histogram with same name. I want to merge ( or add ) these two > files into one file such that my hisograms intries should add. > Please send me a macro to do this, I was trying to do it from > root-tutorial ( how to add histogram ) but i am not able to do it. its > not working ( or either i donot know how to use it ) > > I was doing like this > > root> .L hist_add.C > root> histadd(); > > its went in to the void loop but after looking output file it seems that > it have not done any thing. > > Thanks > Avdhesh
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