Create a Grid object.
A list with the levels of the variables. The length of the list gives the spatial dimension. The i-th element must be a numeric vector containing the distinct values of the corresponding variable.
Integer vector giving the number of levels by
dimension. This formal argument is used only when
If the list
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
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
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