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May 20, 2009


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Thank you for this.

Another solution is to use reshape package:

cast(mtcars, cyl ~ ., quantile, value = "mpg")

Or the plyr package.

By the way, I've had some bad experiences with do.call(rbind, ...) when there is a huge number of lists.

the URL has died, along with the server i had the post on. it lives again here:


if you care to see it.

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