8000 Keep `Date` class when performing a `mean` calculation · Issue #1023 · Rdatatable/data.table · GitHub
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Keep Date class when performing a mean calculation #1023

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DavidArenburg opened this issue Jan 27, 2015 · 2 comments
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Keep Date class when performing a mean calculation #1023

DavidArenburg opened this issue Jan 27, 2015 · 2 comments
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@arunsrinivasan
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v1.9.6

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@DavidArenburg
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library(data.table)
DT <- data.table(Period = rep(1:3, each = 3), Date = as.Date(seq(Sys.Date(), (Sys.Date() + 8), by = "day")))

aggregate(Date ~ Period, DT, mean)
#   Period       Date
#1      1 2015-01-28
#2      2 2015-01-31
#3      3 2015-02-03

DT[, .(mean(Date)), Period]
#    Period    V1
#1:      1 16463
#2:      2 16466
#3:      3 16469
@arunsrinivasan arunsrinivasan self-assigned this Jan 27, 2015
@arunsrinivasan arunsrinivasan added this to the v1.9.6 milestone Jan 27, 2015
@DavidArenburg
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@Arun you are awesome

@arunsrinivasan
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@DavidArenburg 👍

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