БА
Size: a a a
БА
IS
ДВ
IS
БА
АК
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АК
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АК
/usr/bin/Rscript
лучше. И -e
надо убрать.БА
/usr/bin/Rscript
лучше. И -e
надо убрать.AP
АК
list
(V1, V2 = V3 == "Text")
AP
list
(V1, V2 = V3 == "Text")
АК
> library(data.table)
> x <- as.data.table(iris)
> x[, .(m = mean(Petal.Width)), by = .(Species, Setosa = Species == "setosa")]
Species Setosa m
1: setosa TRUE 0.246
2: versicolor FALSE 1.326
3: virginica FALSE 2.026
AP
> library(data.table)
> x <- as.data.table(iris)
> x[, .(m = mean(Petal.Width)), by = .(Species, Setosa = Species == "setosa")]
Species Setosa m
1: setosa TRUE 0.246
2: versicolor FALSE 1.326
3: virginica FALSE 2.026
АК
get(gr)
тогда.AP
get(gr)
тогда.O