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Dear all, I have a dataframe with 132 columns and 100 rows. Every 2nd column is a repeat measurement so that the columns could be titled, a a b b c c d d etc. I would like to average the repeats such that I am left with a data frame of 66 columns (of means) and 100 rows. I have been trying to use rowMeans but have not been able to average the pairs of columns, only the whole dataframe. Any

I''m looking at using EC2 for hosting deploying my Rails site. The reasons for the decision are these: I want something that will work for 10 users, but with capacity to expand to 10,000,000 if needed. EC2 starts at $15/month (before bandwidth) which seems reasonable even for a site in its infancy. And the costs seem to scale up well, along with the capacity. There isn''t the