Mutate columns in data.frame

Analogous function for mutate and transmute in dplyr.

mutate_dt(data, ...)

transmute_dt(data, ...)

Arguments

data	data.frame
...	List of variables or name-value pairs of summary/modifications functions.

Value

data.table

See also

mutate

Examples

iris %>% mutate_dt(one = 1,Sepal.Length = Sepal.Length + 1)
#>      Sepal.Length Sepal.Width Petal.Length Petal.Width   Species one
#>   1:          6.1         3.5          1.4         0.2    setosa   1
#>   2:          5.9         3.0          1.4         0.2    setosa   1
#>   3:          5.7         3.2          1.3         0.2    setosa   1
#>   4:          5.6         3.1          1.5         0.2    setosa   1
#>   5:          6.0         3.6          1.4         0.2    setosa   1
#>  ---                                                                
#> 146:          7.7         3.0          5.2         2.3 virginica   1
#> 147:          7.3         2.5          5.0         1.9 virginica   1
#> 148:          7.5         3.0          5.2         2.0 virginica   1
#> 149:          7.2         3.4          5.4         2.3 virginica   1
#> 150:          6.9         3.0          5.1         1.8 virginica   1
iris %>% transmute_dt(one = 1,Sepal.Length = Sepal.Length + 1)
#>      one Sepal.Length
#>   1:   1          6.1
#>   2:   1          5.9
#>   3:   1          5.7
#>   4:   1          5.6
#>   5:   1          6.0
#>  ---                 
#> 146:   1          7.7
#> 147:   1          7.3
#> 148:   1          7.5
#> 149:   1          7.2
#> 150:   1          6.9