Feature request: top_frac

[zx8754]

Similar to sample_n and sample_frac, can we have top_frac?

Task: Using mtcars data, sort by mpg, then get 5%.

Currently, we could use top_n as below:

library(dplyr)
top_n(x = mtcars, n = round(nrow(mtcars) * 0.05), wt = mpg)
#    mpg cyl disp hp drat    wt  qsec vs am gear carb
# 1 32.4   4 78.7 66 4.08 2.200 19.47  1  1    4    1
# 2 33.9   4 71.1 65 4.22 1.835 19.90  1  1    4    1

But with top_frac it would look neater, something like:

top_frac(x = mtcars, size = 0.05, wt = mpg)

[romainfrancois]

Before we can do that, top_n() should allow quosures for n, i.e. this should be alright:

library(dplyr, warn.conflicts = FALSE)

top_n(mtcars, n() / 2)
#> Selecting by carb
#> n() should only be called in a data context

^{Created on 2019-06-10 by the reprex package (v0.2.1)}

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