I work with people who generate a lot of microarray data. One question that they often ask is: can we find those genes with a two-fold or more change in median expression under two or more different conditions?
For example, let’s say that we have 3 conditions: “normal”, “adenoma” and “cancer”. That gives us 3 pairwise comparisons: normal-adenoma, normal-cancer and adenoma-cancer. Here’s a Ruby solution to the problem.
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