df_to_blocks.RdSplit a data frame into a list of blocks (either by rows or by columns)
df_to_blocks(DataFrame, blocks, byrow = TRUE)a data frame to split
either a list or a vector indicating the
blocks. If blocks is a list of vectors, then the
length of each vector defines the size of the blocks. If
blocks is a vector, then each element represents
the size of the blocks.
logical. If TRUE (the default) the
data frame is split by rows, otherwise the data frame is
split by columns
A list of data frames
# say you have a data frame
iris_df = iris[c(1:3,51:53,101:103),]
# list defining the blocks
row_blocks = list(1:3, 4:6, 7:9)
col_blocks = c(2, 2, 1)
# split data into list of blocks (by rows)
df_to_blocks(iris_df, row_blocks)
#> [[1]]
#> Sepal.Length Sepal.Width Petal.Length Petal.Width Species
#> 1 5.1 3.5 1.4 0.2 setosa
#> 2 4.9 3.0 1.4 0.2 setosa
#> 3 4.7 3.2 1.3 0.2 setosa
#>
#> [[2]]
#> Sepal.Length Sepal.Width Petal.Length Petal.Width Species
#> 51 7.0 3.2 4.7 1.4 versicolor
#> 52 6.4 3.2 4.5 1.5 versicolor
#> 53 6.9 3.1 4.9 1.5 versicolor
#>
#> [[3]]
#> Sepal.Length Sepal.Width Petal.Length Petal.Width Species
#> 101 6.3 3.3 6.0 2.5 virginica
#> 102 5.8 2.7 5.1 1.9 virginica
#> 103 7.1 3.0 5.9 2.1 virginica
#>
# split data into list of blocks (by columns)
df_to_blocks(iris_df, col_blocks, byrow=FALSE)
#> [[1]]
#> Sepal.Length Sepal.Width
#> 1 5.1 3.5
#> 2 4.9 3.0
#> 3 4.7 3.2
#> 51 7.0 3.2
#> 52 6.4 3.2
#> 53 6.9 3.1
#> 101 6.3 3.3
#> 102 5.8 2.7
#> 103 7.1 3.0
#>
#> [[2]]
#> Petal.Length Petal.Width
#> 1 1.4 0.2
#> 2 1.4 0.2
#> 3 1.3 0.2
#> 51 4.7 1.4
#> 52 4.5 1.5
#> 53 4.9 1.5
#> 101 6.0 2.5
#> 102 5.1 1.9
#> 103 5.9 2.1
#>
#> [[3]]
#> [1] setosa setosa setosa versicolor versicolor versicolor virginica
#> [8] virginica virginica
#> Levels: setosa versicolor virginica
#>