Dear Monks, I do not program Perl very often, and if I do it is mainly on a line by line basis. I'm often running into issues when I have to manipulate data across columns. What I need currently is to stack columns of a table onto each other. My data looks like: 
foo1    1    4    7
foo2    2    5    8
foo3    3    6    9

[download]
And I need it in 
foo1    1
foo2    2
foo3    3
foo1    4
foo2    5
foo3    6
foo1    7
foo2    8
foo3    9

[download]
That is, in column one are the identifiers, and the numbers following from the 2nd column are its values. Obviously I have to read in the whole table and then print column one followed by its values in column 2, then print column 1 again, followed by its values in column 3, and so forth. After some searching it seems that I need to build a hash of arrays, and from that call the data from a loop? However, as I said, I usually do text manipulations line by line, and what I found so far was rather confusing. I hope someone can help me here. Cheers, Robert

In reply to Stack table columns with hash of arrays by robertkraus

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