shift give.names could apply auto-name logic to list() input

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#3,905 opened on Sep 23, 2019 6 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 3/5
Estimated time: 1-2 days
Newbie friendliness: 45/100

Issue type: Bug
Clarity: Mostly clear
Activity status: Stale
Tech stack: r
Domain: data

Research direction

Start by reproducing the shown data.table call to shift() with the list input and give.names = TRUE, then locate the shift() naming logic. Compare the result with the usual auto-naming for latitude and longitude, and add regression coverage showing the expected names.

Written by the indexing model from the issue text.

Description

feature request

set.seed(38493)
DT = data.table(latitude = runif(10, -90, 90), longitude = runif(10, -180, 180))
DT[ , shift(.(latitude, longitude), c(-1L, 1L), give.names = TRUE)]

    V1_lead_1   V1_lag_1  V2_lead_1   V2_lag_1
 1: -38.96353         NA -147.14499         NA
 2:  29.04300   2.298902  -11.81201   44.61912
 3:  85.19639 -38.963529  178.86941 -147.14499
 4: -18.45281  29.042995 -159.37338  -11.81201
 5: -24.63941  85.196393  -74.79962  178.86941
 6:  39.93444 -18.452807  -63.89377 -159.37338
 7:  89.09799 -24.639414   10.13899  -74.79962
 8: -39.62935  39.934439  111.02200  -63.89377
 9:  45.81521  89.097989   69.86217   10.13899
10:        NA -39.629354         NA  111.02200

I kind of expected give.names to apply the "usual" (in data.table context at least) auto-names to the .(latitude, longitude) input.

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