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Feature request: top_frac #4017

zx8754 opened this issue Dec 13, 2018 · 2 comments

Feature request: top_frac #4017

zx8754 opened this issue Dec 13, 2018 · 2 comments
feature a feature request or enhancement


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zx8754 commented Dec 13, 2018

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:

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 romainfrancois added the feature a feature request or enhancement label Dec 13, 2018
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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)

@romainfrancois romainfrancois added this to the 0.8.2 milestone Jun 10, 2019
@romainfrancois romainfrancois self-assigned this Jun 10, 2019
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lock bot commented Dec 8, 2019

This old issue has been automatically locked. If you believe you have found a related problem, please file a new issue (with reprex) and link to this issue.

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