funxy(f, W)function in the Rlanguage
with arguments x,y (at least)"owin") inside which the
function is well-defined.function, in fact a copy of f,
which also belongs to the class "funxy".
This class has methods for
print, plot, contour and persp."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 Rlanguage.
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.
plot.funxyf <- function(x,y) { x^2 + y^2 - 1}
g <- funxy(f, square(2))
g(0.2, 0.3)
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