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xanadu - xml b-tree - 3

This commit is contained in:
erana 2012-01-21 00:52:58 +09:00
parent 0e25720779
commit ec6815345e
1 changed files with 8 additions and 5 deletions
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13
scsh/xanadu/b-tree.scm
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@ -27,11 +27,14 @@
;;; THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
(define (vector-median v)
(let ((retv (make-vector (inexact->exact (/ (vector-length v) 2)))))
(do ((i 0 (+ i 1)))
((= i (/ (vector-length v) 2)) retv)
(vector-set! retv i (vector-ref v i))
)))
(let ((len (ceiling (/ (vector-length v) 2))))
(let ((retl (make-vector len))
(retr (make-vector len)))
(do ((i 0 (+ i 1)))
((= i len) (list retl retr))
(vector-set! retl i (vector-ref v i))
(vector-set! retr i (vector-ref v (- len (+ i 1))))
)))
(define (make-b-tree)
(let ((*tree (make-vector 0)))