The n-dimensional "cross" structuring element. A numeric radius (or list of
CrossMatrix[r]
CrossMatrix[r, w]
CrossMatrix[{r1, r2, …}, …]
CrossMatrix[{a, b, c}]
→
CrossMatrix::notre: The first argument {a, b, c} must be a non-complex number or a list of non-complex numbers.
CrossMatrix[{a, b, c}]