define an object in an R session as a data greta array for use as data in a greta model.




an R object that can be coerced to a greta_array (see details).


as_data() can currently convert R objects to greta_arrays if they are numeric or logical vectors, matrices or arrays; or if they are dataframes with only numeric (including integer) or logical elements. Logical elements are always converted to numerics. R objects cannot be converted if they contain missing (NA) or infinite (-Inf or Inf) values.


# numeric/integer/logical vectors, matrices and arrays can all be coerced to
# data greta arrays

vec <- rnorm(10)
mat <- matrix(seq_len(3 * 4), nrow = 3)
arr <- array(sample(c(TRUE, FALSE), 2 * 2 * 2, replace = TRUE),
             dim = c(2, 2, 2))
(a <- as_data(vec))
(b <- as_data(mat))
(c <- as_data(arr))

# dataframes can also be coerced, provided all the columns are numeric,
# integer or logical
df <- data.frame(x1 = rnorm(10),
                 x2 = sample(1L:10L),
                 x3 = sample(c(TRUE, FALSE), 10, replace = TRUE))
(d <- as_data(df))
# }