‘Splat’ arguments to a function.
Wraps a function in do.call, so instead of taking multiple arguments, it takes a single named list which will be interpreted as its arguments.
splat(flat)
flat |
function to splat |
This is useful when you want to pass a function a row of data frame or array, and don't want to manually pull it apart in your function.
a function
hp_per_cyl <- function(hp, cyl, ...) hp / cyl splat(hp_per_cyl)(mtcars[1,]) splat(hp_per_cyl)(mtcars) f <- function(mpg, wt, ...) data.frame(mw = mpg / wt) ddply(mtcars, .(cyl), splat(f))
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