Construction

A Frame stores columns of one row count. from_pairs keeps the listed column order and rejects duplicate names or unequal column lengths. The four column forms are:

Form	Stored values
FloatCol	tensor[n, f32]
IntCol	tensor[n, i64] and a tensor[n, bool] missing-value mask
BoolCol	tensor[n, bool]
StringCol	List[string]

Use int_col_of_list to make an integer column with no missing entries. from_columns and empty accept dictionaries, whose entry order determines the resulting column order; use from_pairs when order matters.

module Coral.BookConstruct
import Coral.Frame (FloatCol, StringCol, from_pairs, get_float_col)
export (main)
def main() -> f32 = {
  frame = from_pairs([("price", FloatCol(to_tensor([1.0f32, 2.0f32]))), ("name", StringCol(["a", "b"]))])
  prices = get_float_col(frame, "price")
  index(to_list(prices), 1i64)
}

get_float_col returns a Chelis tensor, so main reads the second price and returns 2.0. The other typed accessors are get_int_col, get_bool_col, and get_string_col. A missing name or a mismatched column type fails when the accessor runs.