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CrossMatrix

CrossMatrix[r]
gives a matrix whose elements are

in a centered cross-shaped region that extends r positions along each index direction, and are

otherwise.

CrossMatrix[r, w]
gives a w×w matrix containing a cross-shaped region of

CrossMatrix[{r₁, r₂, ...}, ...]
yields an array whose elements are

in a centered cross-shaped region that extends r_i positions in the i

index direction.

In CrossMatrix[r] or CrossMatrix[{r₁, ...}] the matrix or array is sized so as to just include all nonzero elements.

CrossMatrix[All, w] gives a w×w matrix containing a cross shape that is as large as possible.

CrossMatrix[All, {w₁, ..., w_n}] gives a w₁×...×w_n array containing a cross-shaped region that is as large as possible.

Elements of CrossMatrix[r] are 1 if their edit distance from the center is not more than 1.

The parameter r need not be an integer; in an odd-dimensional array, the cross extends Floor[Abs[r+1/2]] pixels from the origin.

The lines of the cross have width 1 if the corresponding dimension is odd and width 2 otherwise.

This computes and plots a 3 by 3 cross matrix: