frame/frame

(frame [sch : int columns : int] :)

build a frame from a schema and a cons list of column handles.

(let [s (schema (cons (field "x" (type-int32) 0) 0))
        c (column-int32 (cons 1 (cons 2 0)) 0 0)
        f (frame s (cons c 0))]
    (frame-nrows f))   ; => 2

Since: FR0

(frame-nrows [f : int] :)

number of rows. Since: FR0

(frame-ncols [f : int] :)

number of columns. Since: FR0

(frame-schema [f : int] :)

schema handle (still owned by the frame). Since: FR0

(frame-column-at [f : int i : int] :)

column handle at index i (0-based). Returns 0 if out of range.

Since: FR0

(frame-column [f : int name : cstr] :)

column handle for a named column. Returns 0 if not found.

Since: FR0

(frame-slice [f : int offset : int length : int] :)

a new frame containing rows [offset, offset+length).

Since: FR0

(frame-head [f : int n : int] :)

a new frame containing the first n rows.

Since: FR0

(frame-free [f : int] :)

release a frame's schema, columns, and descriptor.

Since: FR0

(frame [a : int b : int] :)

structural equality across schema (names + types) and every cell.

Since: FR2