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Softw. 24(1): 130-156).\nEXPOKIT includes functions for exponentiating both small, dense\nmatrices, and large, sparse matrices (in sparse matrices, most\nof the cells have value 0). Rapid matrix exponentiation is\nuseful in phylogenetics when we have a large number of states\n(as we do when we are inferring the history of transitions\nbetween the possible geographic ranges of a species), but is\nprobably useful in other ways as well. 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