Created
November 20, 2015 21:05
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| # split data per Species | |
| species_frames <- split(iris,iris$Species) | |
| # calculate mean per species | |
| lapply(species_frames, function(x) colMeans(x[,"Sepal.Length"])) | |
| # simple version of ^^ calculate mean over Sepal.Length split by Species | |
| tapply(iris$Sepal.Length, iris$Species, mean) |
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