Data Frame Creation -- R data.table¶

In [1]:

library(data.table)

library(data.table)

From columns¶

In [3]:

# Columns from vectors
data.table::data.table(
    x = c(1,2,3),
    y = c('a', 'b', 'c'),
    z = c(TRUE, FALSE, TRUE)
)

# Columns from vectors data.table::data.table( x = c(1,2,3), y = c('a', 'b', 'c'), z = c(TRUE, FALSE, TRUE) )

A data.table: 3 × 3

x	y	z
<dbl>	<chr>	<lgl>
1	a	TRUE
2	b	FALSE
3	c	TRUE

From rows¶

In [7]:

# From list of keyed rows
# ndjson / jsonl format

data.table::rbindlist(list(
    list(x = 1, y = 'a', z = TRUE),
    list(x = 2, y = 'b', z = FALSE),
    list(x = 3, y = 'c', z = TRUE)
))

# From list of keyed rows # ndjson / jsonl format data.table::rbindlist(list( list(x = 1, y = 'a', z = TRUE), list(x = 2, y = 'b', z = FALSE), list(x = 3, y = 'c', z = TRUE) ))

A data.table: 3 × 3

x	y	z
<dbl>	<chr>	<lgl>
1	a	TRUE
2	b	FALSE
3	c	TRUE

From matrix¶

In [13]:

mat = matrix(1:9, nrow=3)
print(mat)
data.table::data.table(mat)

mat = matrix(1:9, nrow=3) print(mat) data.table::data.table(mat)

     [,1] [,2] [,3]
[1,]    1    4    7
[2,]    2    5    8
[3,]    3    6    9

A data.table: 3 × 3

V1	V2	V3
<int>	<int>	<int>
1	4	7
2	5	8
3	6	9

In [ ]: