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# This is the same as the "recomposition" at the end of recipes::bake()
recompose <- function(data, composition) {
if (identical(composition, "tibble")) {
data
} else if (identical(composition, "dgCMatrix")) {
convert_matrix(data, sparse = TRUE)
} else if (identical(composition, "matrix")) {
convert_matrix(data, sparse = FALSE)
} else {
abort("Internal error: Unknown `composition` type.")
}
}
convert_matrix <- function(x, sparse = TRUE) {
is_num <- vapply(x, is.numeric, logical(1))
if (!all(is_num)) {
num_viol <- sum(!is_num)
if (num_viol < 5) {
abort(
paste0(
"Columns (",
paste0("`", names(is_num)[!is_num], "`", collapse = ", "),
") are not numeric; cannot convert to matrix."
)
)
} else {
abort(
paste0(
num_viol,
" columns are not numeric; cannot ",
"convert to matrix."
)
)
}
}
# At this point, all cols are numeric so we can just use as.matrix()
res <- as.matrix(x)
if (sparse) {
if (!is_installed("Matrix")) {
abort("The Matrix package must be installed to use a 'dgCMatrix' `composition`")
}
res <- Matrix::Matrix(res, sparse = TRUE)
}
res
}
validate_composition <- function(composition) {
arg_match0(
arg = composition,
values = c("tibble", "matrix", "dgCMatrix"),
arg_nm = "composition"
)
}
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