Calculate the sufficient statistic of the Potts model for the given labels.
sufficientStat(labels, neighbors, blocks, k)
| labels | A matrix of pixel labels. |
|---|---|
| neighbors | A matrix of all neighbors in the lattice, one row per pixel. |
| blocks | A list of pixel indices, dividing the lattice into independent blocks. |
| k | The number of unique labels. |
The sum of like neighbors.