generates an evenly spaced grid given an input vector, matrix, or
data.frame which has size
a vector, matrix, or
an integer giving the length of the grid.
an object of the same type as
length.out or fewer unique values.
for unordered factors and characters, if
length.out < length(unique(x))
length.out is set to
x is a
data.frame and this is true of some columns but not others, there will be a warning.
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