A toolbox for working with R arrays in a functional programming style. Flexibly split, bind, reshape, modify, subset, and name arrays.
The package provides:
split_on_dim()
and split_along_dim()
which take an array and return a list.
bind_on_dim()
and bind_as_dim()
take a
list and return an array.
modify_along_dim()
takes an array, calls the passed
function .f()
on each subset of the specified dimension,
and returns an array of the same shape. (think of this as a safer and
sometimes faster alternative to base::apply()
that is
guaranteed to return an array of the same shape as it received)
extract_dim()
a wrapper around [
that
allows you to specify the dimension being subset as a function argument.
For example, extract_dim(X, 1, idx)
will extract
idx
on the first dimension, regardless how many dimensions
are in the array X
. Contrast this with the base alternative
X[idx,,]
, where you have to match the number of commas
,
to the number of dimensions in X
.
Many of the functions have two variants *_rows()
and
*_cols()
for the two most common case of the first and last
dimension. For example split_on_rows()
which is equivalent
to split_on_dim(X, 1)
and split_on_cols()
which is equivalent to split_on_dim(X, -1)
set_dim()
and set_dimnames()
,
pipe-friendly and more flexible versions of dim<-
and
dimnames<-
dim2()<-
, set_dim2()
,
array2()
, which reshape or fills arrays using row-major
(C-style) semantics
t.array()
a transpose method for multi-dimensional
arrays
A handful of lower-level helpers that abstract out patterns
commonly encountered while working with arrays, for example
expand_dims()
(the inverse of base::drop()
, or
seq_along_rows()(a combination of
seq_along()and
nrow()`).
A set of functions that help encode atomic vectors as
onehot()
binary matrix’s and decode_onehot()
back into atomic vectors. (for example if training a neural network with
keras)
Many of the functions work recursively if provided a list of arrays.
You can install listarrays from CRAN with:
install.packages("listarrays")
Or install the development version from github with:
::install_github("t-kalinowski/listarrays") devtools