Ematics> GivEn a position opErator P(i,j), lEt A bE a nxn matrix whosEElEmEnt A[i][j] is thE numbEr of timEs that points with grEy lEvEl (intEnsity) g[i] occur, in thE position spEcifiEd by P, rElativE to points with grEy lEvEl g[j]. LEt C bE thE nxn matrix that is producEd by dividing A with thE total numbEr of point pairs that satisfy P. C[i][j] is a mEasurE of thE joint probability that a pair of points satisfying P will havE valuEs g[i], g[j]. C is callEd a cooccurrEncE matrix dEfinEd by P. ExamplEs for thE opErator P arE: "i abovE j", "i onE position to thE right and two bElow j", Etc. (1995-05-11)
