


ddf
 Purpose
 This function calculates the directional distribution of points defined in [1] of a point process returning the distributions in matrix T.
 Synopsis
 T = ddf(H, r1, r2)
T = ddf(H, r1, r2, N)
T = ddf(H, r1, r2, N, str)
[T, a] = ddf(H, ...)
 Description
 T=ddf(H, r1, r2) calculates the directional distribution T of points in B, type uint8, such that r1<=xy<r2.
T=ddf(H, r1, r2, N) specifies the number of angular bins as N, (default=72).
T=ddf(H, r1, r2, N, str), when str="cluster", ddf calculates the direction distribution of daughter points about a parent point.
[T, a]=ddf(H, ...) returns the center angle for each bin of T in a.
 See Also
 nnt
 Reference
 [1] J. Ohser, D. Stoyan, On the secondorder and orientation analysis of planar stationary point processes, Biometrics Journal, Vol. 23, 1981.
 Author
 Daniel Leo Lau, Copyright August 18, 1997.
Dr. Daniel Leo Lau
Department of Electrical and Computer Engineering
University of Kentucky
453 Anderson Hall
Lexington, KY 405060046, USA
(859) 2572300 x273
dllau@engr.uky.edu
last edited on 4/20/04


