Yea you are right! I copy my codes wrongly. It should be $outfile_1. My problem is that I have no idea on how to perform calculation from the csv files generated. I wish to generate a %skew by using the data in column 'skew' and 'period' *Formula: ('skew' / 'period')100.* Can you give me some idea on how to continue? Thanks

In reply to Re^2: How to add a new column into my csv file? by chaney123
in thread How to add a new column into my csv file? by chaney123

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