attached is the screenshot of my saved datafiles and root session. Thank you for your time.
According to the output the TTree you are reading contains no data. This means that when producing it, the function TTree::Fill was never called and you new review this writing code.
Thank you for your response. sorry don`t be tired of me. i am a novice at this. How can i review this and call the function “TTree::Fill”. Thank you for your time.
You should go back to the C++ code which created this ROOT file. Is it your program ? If somebody else wrote it you may ask her/him for some advice.
Thank you for your response. actually somebody wrote it. will ask for advice from him. Thank you for your time.
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