Library: | spatial |
See also: | SPPPinit SPPPinitrandom SPPPsetregion SPPPgetregion SPPPkfn SPPPpsim SPPPstrauss SPPPkenvl SPPPkaver |
Quantlet: | SPPPssi | |
Description: | Simulates a SSI (sequential spatial inhibition) point process. Note that SPPPinit or SPPPsetregion must have been called before to set the domain. To be able to reproduce results, reset the random number generator for point processes by calling SPPPinitrandom first. Note that this quantlet will never return a result if r is too large and it is impossible to place n points. |
Usage: | ppssi = SPPPssi (nsim, n, r) | |
Input: | ||
nsim | scalar - number of simulations | |
n | scalar - number of points in the domain | |
r | scalar - inhibition distance | |
Output: | ||
res | list - consisting of components xmat, ymat, type -- | |
xmat | n x nsim - matrix consisting of x coordinates | |
ymat | n x nsim - matrix consisting of y coordinates | |
type | string - "SSI" |
; load the spatial statistics library library ("spatial") ; read a spatial data set pines = read ("pines.dat") ; initialize a point process pinesobj = SPPPinit (pines, 0, 96, 0, 100, 10) ; reset random number generator SPPPinitrandom (0) ; simulate 100 SSI point processes (with r = 0.7), ; each consisting of 72 points, in the previously ; determined domain ppssi = SPPPssi (100, 72, 0.7)
List, consisting of x and y coordinates of 100 Strauss point processes, each consisting of 72 points.
Library: | spatial |
See also: | SPPPinit SPPPinitrandom SPPPsetregion SPPPgetregion SPPPkfn SPPPpsim SPPPstrauss SPPPkenvl SPPPkaver |