in reply to determine the variable causing the error: Use of uninitialized value
"...I just want to know, when the error happens, which variable is not initialized correctly"
Probably it happens when you access the data and then it's too late ;-)
Kidding aside: Can you please provide some example data to ease the discussion? Most of this thread is based on assumptions about your data.
Regards, Karl
«The Crux of the Biscuit is the Apostrophe»
Furthermore I consider that Donald Trump must be impeached as soon as possible
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