# has useful display methods
Code
dt <- lazy_dt(mtcars, "DT")
dt
Output
Source: local data table [32 x 11]
Call: DT
mpg cyl disp hp drat wt qsec vs am gear carb
<dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl>
1 21 6 160 110 3.9 2.62 16.5 0 1 4 4
2 21 6 160 110 3.9 2.88 17.0 0 1 4 4
3 22.8 4 108 93 3.85 2.32 18.6 1 1 4 1
4 21.4 6 258 110 3.08 3.22 19.4 1 0 3 1
5 18.7 8 360 175 3.15 3.44 17.0 0 0 3 2
6 18.1 6 225 105 2.76 3.46 20.2 1 0 3 1
# ... with 26 more rows
# Use as.data.table()/as.data.frame()/as_tibble() to access results
Code
dt %>% group_by(vs, am)
Output
Source: local data table [32 x 11]
Groups: vs, am
Call: DT
mpg cyl disp hp drat wt qsec vs am gear carb
<dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl>
1 21 6 160 110 3.9 2.62 16.5 0 1 4 4
2 21 6 160 110 3.9 2.88 17.0 0 1 4 4
3 22.8 4 108 93 3.85 2.32 18.6 1 1 4 1
4 21.4 6 258 110 3.08 3.22 19.4 1 0 3 1
5 18.7 8 360 175 3.15 3.44 17.0 0 0 3 2
6 18.1 6 225 105 2.76 3.46 20.2 1 0 3 1
# ... with 26 more rows
# Use as.data.table()/as.data.frame()/as_tibble() to access results
Code
dt %>% mutate(y = 10) %>% compute("DT2")
Output
Source: local data table [32 x 12]
Call:
DT2 <- copy(DT)[, `:=`(y = 10)]
DT2
mpg cyl disp hp drat wt qsec vs am gear carb y
<dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl>
1 21 6 160 110 3.9 2.62 16.5 0 1 4 4 10
2 21 6 160 110 3.9 2.88 17.0 0 1 4 4 10
3 22.8 4 108 93 3.85 2.32 18.6 1 1 4 1 10
4 21.4 6 258 110 3.08 3.22 19.4 1 0 3 1 10
5 18.7 8 360 175 3.15 3.44 17.0 0 0 3 2 10
6 18.1 6 225 105 2.76 3.46 20.2 1 0 3 1 10
# ... with 26 more rows
# Use as.data.table()/as.data.frame()/as_tibble() to access results
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