Array | R Documentation |
Convenient function linking sparse Arrays from the package spam
to the sparse Matrices from the package Matrix
.
Array(A)
sparseArray(i, v = NULL, ...)
as.Matrix(M)
A |
An array to be turned into a sparse Array using |
i |
Integer matrix of array indices passed to |
v |
vector of values passed to |
M |
Matrix of type |
... |
Further arguments passed to |
Array
turns an array
into a sparse Array. There is a special behavior when a dataframe
is supplied. Such a dataframe is treated as 'long format', i.e. the columns of the dataframe are treated as dimensions of the Array, and all rows of the dataframe are interpreted as entries. The coordinates are given by the ordering of the levels in the dataframe, and the dimnames are given by the levels.
sparseArray
constructs sparse Arrays from a matrix of indices and a vector of values. dim and dimnames can be added as in simple_sparse_array
as.Matrix
turns a simple_triplet_matrix
into a dgTMatrix
.
Sparse Arrays use the class "simple_sparse_array" from spam
These functions are only an example of how spam
can be linked to Matrix
.
Michael Cysouw
x <- matrix(c(1, 0, 0, 2), nrow = 2)
s <- as.simple_triplet_matrix(x)
str(s)
as.Matrix(s)
str(as.Matrix(s))
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