Dear Rooters You helped me already a lot of times and I need your help once more. Thank you in advance. This week I made some test measurements in T9 at CERN. I read out 50 ADC channels and 2 wired chambers (4 plains). I made runs of about 20'000 evemts. Now I have to following data structure in binary files: data is structured in spills of about 400 events. First there all ADC values of one spill, last second are the values (coordinates)of the wired chambers of one spill. Now, I have to: - read in binary data - match the events together - make plots (wired chamber coordinates against ADC values) My questions about this: -What's is the fastest way to read in binary data? The flags, the adc values, the wired chambers coordinates are all u_shorts in the DAQ software. So I have to read words of 2 bytes. - I can fill a TNtuple with the ADC values and an other NTuple with the wired chambers coordinates. How can I match these NTuples together? - Can I do plots out of two NTuples? - Or is TNtuple the wrong way to solve my problem? Thank you very much for your help!! Christian -- Christian Haeberli University of Bern Laboratory for High Energy Physics Sidlerstr. 5 CH-3012 Bern
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