Grid | R Documentation |
Grid
objectCreate a Grid object.
Grid(levels, nlevels = NULL, dimNames = NULL, index = NULL)
levels |
A list with the levels of the variables. The length
of the list gives the spatial dimension. The |
nlevels |
Integer vector giving the number of levels by
dimension. This formal argument is used only when |
dimNames |
If the list |
index |
An array with integer values and dimension corresponding to the spatial dimensions. Each value represent the number of the corresponding node in a "flat" representation (data.frame or matrix), and will be used in tasks such as interpolation. |
An object with S4 class "Grid"
. If needed, this
object can be coerced to a data frame or to a matrix by using the
methods as.data.frame
or as.matrix
.
If index
is not provided, the vectors in the
levels
list can be unsorted, and they will be
sorted. However, when a non-default index
is provided, the
levels must be sorted. This rule is intended to reduce the risk of
error.
Yves Deville
myGD1 <- Grid(levels = list("X" = c(0, 1), "Y" = c(0.0, 0.5, 1.0)))
## the same with less effort
myGD2 <- Grid(nlevels = c("X" = 2, "Y" = 3))
nlevels(myGD2)
levels(myGD2)
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