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Alex Rivera
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I would like to calculate sums for certain columns and then apply this summation for every row. Unfortunately, I can only get to the first step. How do I now make it happen for each row? I know that R doesn't need loops; what are good approaches? My matrix (zscore) looks like this: a b c t y 1 3 4 7 7 4 2 4 56 6 6 4 3 3 3 2 1 7 4 3 88 9 9 9 Now I would want to calculate the row sum for each row, based on some of the columns. For one row it could look like this: f1 <- sum(zscore[1,1:2], zscore[1,3], zscore[1,5]) How do I do that now for each row?
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