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factor_to_indicators errors with unhelpful message if a factor has only one level #285
Description
grbg <- data.table(y = 1:10, x = as.factor(rep("F", 10)), z = 1:10)
grbg_task <- sl3_Task$new(data = grbg,
covariates = c("x", "z"),
outcome = "y")
grbg_task$XObviously this is sort of a user error, but the error message is
Error in ind_ref_mat[as.numeric(x), , drop = FALSE] :
incorrect number of dimensions
which is not helpful. And I could see users processing data without fully checking that all levels of a factor are present (that's what I did 😳).
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