Generates a ``stratified random'' pattern of points in a window,
by dividing the window into rectangular tiles and placing
k random points independently in each tile.
Usage
rstrat(win=square(1), nx, ny=nx, k = 1)
Arguments
win
A window.
An object of class owin,
or data in any format acceptable to as.owin().
nx
Number of tiles in each column.
ny
Number of tiles in each row.
k
Number of random points to generate in each tile.
Value
A point pattern (object of class "ppp").
Details
The bounding rectangle of win is divided into
a regular $nx \times ny$ grid of rectangular tiles.
In each tile, k random points are generated independently
with a uniform distribution in that tile.
Some of these grid points may lie outside the window win:
if they do, they are deleted.
The result is a point pattern inside the window win.
This function is useful in creating dummy points for quadrature
schemes (see quadscheme) as well as in simulating
random point patterns.