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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.

gives a w

w matrix containing a cross-shaped region of

yields an array whose elements are

in a centered cross-shaped region that extends

positions in the i

index direction.

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

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

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

Elements of CrossMatrix[r] are 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 cross matrix:

Out[1]=

Create a rectangular cross matrix:

Specify the matrix size:

Extend the cross to the boundaries of the matrix:

Automatically choose an odd width to just fit the cross:

Extend the cross to the given width and automatically choose the height: