data <- matrix(
c(1, NA, 3, 4),
nrow = 2,
dimnames = list(c("x1", "x2"), c("s1", "s2"))
)
metadata <- data.frame(class = c("A", "B"), row.names = c("s1", "s2"))
dataset <- list(data = data, metadata = metadata)
count_missing_values(dataset)
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