Re^5: How to loop over two lines, alter a value in the current line and save it to the previous line?

Why do you need $previous_line if you already have @previous_columns?

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Re^6: How to loop over two lines, alter a value in the current line and save it to the previous line? by rjc33 (Sexton) on Jan 07, 2016 at 12:09 UTC
Apologies, I should have said that it makes the values within @previous_columns always refer to those in the first line. So for example in the 2nd iteration of the loop @previous_columns holds values from the first line, when I want to hold values from the second line (while the loop is performing actions on the 3rd line).	[reply]