POLYOMINO_INDEX, a MATLAB library which is given a matrix defining a region R or polyomino P, and determines a correspondingly shaped matrix which contains an index for each nonzero entry.
The indexing scheme starts at the upper left corner, and proceeds by rows.
For instance, the matrix representing P might be:
1 0 1 1 1 1 1 0 0 1 1 0in which case, the index matrix PIN would be:
1 0 2 3 4 5 6 0 0 7 8 0
The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.