XploRe Help : SPPPinitrandom

Keywords - Function groups - @ A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Library:	spatial
See also:	SPPPinit SPPPsetregion SPPPgetregion SPPPkfn SPPPpsim SPPPstrauss SPPPssi SPPPkenvl SPPPkaver

Quantlet:		SPPPinitrandom
Description:		resets the random number generator for point processes

Reference(s):

Venables, W. N., Ripley, B. D. (1999): Modern Applied Statistics with S-Plus, Third Edition, Springer, New York

Link:

Tutorial: Spatial statistics

Usage:	`SPPPinitrandom(rstart)`
Input:
	`rstart`	scalar, root for random number generator

Note:

C-Code from Venables, Ripley (1999) forms the basis of this quantlet. Also check this reference for more details.

Example:

; loads the spatial statistics library library("spatial") ; reads a spatial data set pines = read("pines.dat") ; initializes a point process pinesobj = SPPPinit(pines, 0, 96, 0, 100, 10) ; resest random number generator SPPPinitrandom(0) ; creates random point processes sppsim = SPPPpsim(100, 72) sppsim.ymat[1:3,1:3]

Result:

The root for the random number generator for point
processes is set to rstart - thus allowing to repeat
a particular sequence of random numbers.

Contents of _tmp
[1,]  0.030269   7.9305   4.9191
[2,]   4.2072   6.0908     9.97
[3,]   2.3159   8.0506   1.1953

Author: J. Symanzik, 20000725 license MD*Tech