funxy

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Percentile

Spatial Function Class

A simple class of functions of spatial location

Keywords
spatial, math
Usage
funxy(f, W)
Arguments
f

A function in the R language with arguments x,y (at least)

W

Window (object of class "owin") inside which the function is well-defined.

Details

This creates an object of class "funxy". This is a simple mechanism for handling a function of spatial location \(f(x,y)\) to make it easier to display and manipulate.

f should be a function in the R language. The first two arguments of f must be named x and y respectively.

W should be a window (object of class "owin") inside which the function f is well-defined.

The function f should be vectorised: that is, if x and y are numeric vectors of the same length n, then v <- f(x,y) should be a vector of length n.

The resulting function g <- funxy(f, W) has the same formal arguments as f. It accepts numeric vectors x,y as described above, but if y is missing, then x may be a point pattern (object of class "ppp" or "lpp") from which the coordinates should be extracted.

Value

A function with the same arguments as f, which also belongs to the class "funxy". This class has methods for print, plot, contour and persp.

See Also

plot.funxy, summary.funxy

Aliases
  • funxy
Examples
# NOT RUN {
   f <- function(x,y) { x^2 + y^2 - 1} 
   g <- funxy(f, square(2))
   g(0.2, 0.3)
   g
   g(cells[1:4])
# }
Documentation reproduced from package spatstat, version 1.56-1, License: GPL (>= 2)

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