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l <- split(airquality, g)
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l <- split(airquality, g)
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l <- lapply(l, transform, Oz.Z = scale(Ozone))
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l <- lapply(l, transform, Oz.Z = scale(Ozone))
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aq2 <- unsplit(l, g)
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aq2 <- unsplit(l, g)
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head(aq2)
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head(aq2)
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with(aq2, tapply(Oz.Z,  Month, sd, na.rm = TRUE))
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with(aq2, tapply(Oz.Z,  Month, sd, na.rm = TRUE))
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### Split a matrix into a list by columns
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### Split a matrix into a list by columns
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ma <- cbind(x = 1:10, y = (-4:5)^2)
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ma <- cbind(x = 1:10, y = (-4:5)^2)
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split(ma, col(ma))
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split(ma, col(ma))
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