Thank you! I was thinking about it overnight. Two different analyses need the data in different formats. But after thinking about the comments, I asked some people if the dataset can be split in some way. It turns out that it can be split into 30 different files rather than one large one. But I'm going to give the code above a try (just for practice sake). Thanks a bunch and I will report back:)

In reply to Re^2: transposing and matching large datasets by Anonymous Monk
in thread transposing and matching large datasets by wannabemonk

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