Well, the warning says there is an uninitialized value in a pattern match, so clearly that means that $energy_consumption is undefined when you get there. That value is assigned in your split, so therefore the split isn't outputting at least 8 values. I suspect that your input file is not formatted as your expect. A quick way to find the offending lines would be to add the block 

if (not defined $energy_consumption) {
    warn "Split missed, $file: $_";
    next;
}

[download]

after the split, and see what comes out. My guess is that you are working with tab-delimited files, and there are some empty values.

#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.

In reply to Re^2: read the whole folder files by kennethk
in thread read the whole folder files by perllearner007

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