DataBackendMatrix: DataBackend for Matrix

In mllg/mlr3: Machine Learning in R - Next Generation

Description

DataBackend for Matrix. Data is stored as (sparse) matrix.

Format

R6::R6Class object inheriting from DataBackend.

Construction

DataBackendMatrix$new(data, primary_key = NULL)
as_data_backend(data, primary_key = NULL, ...)

• data :: Matrix::Matrix().

• primary_key :: character(1)
  Not supported by this backend. Rows are addresses by their rownames(). If the matrix does not have row names, integer row indices are used.

Fields

See DataBackend.

Methods

See DataBackend.

See Also

Other DataBackend: DataBackendDataTable, DataBackend, as_data_backend

Examples

requireNamespace("Matrix")
data = Matrix::Matrix(sample(0:1, 20, replace = TRUE), ncol = 2)
colnames(data) = c("x1", "x2")
rownames(data) = paste0("row_", 1:10)

b = as_data_backend(data)
b$head()
b$data(b$rownames[1:3], b$colnames, data_format = "Matrix")

mllg/mlr3 documentation built on Sept. 27, 2019, 9:38 a.m.