rstrat
Simulate Stratified Random Point Pattern
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
Details
This function generates a random pattern of points in a ``stratified random'' sampling design. It can be useful for generating random spatial sampling points.
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.
Value
- A point pattern (object of class
"ppp").
See Also
Examples
X <- rstrat(nx=10)
plot(X)
# polygonal boundary
data(letterR)
X <- rstrat(letterR, 5, 10, k=3)
plot(X)