# NOT RUN {
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")
# }
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