 (omitting logarithms):
_0_cumulative(x_t | x_0 = C_0)    ...  q_n_cumulative(x_t | x_0 = C_0)
          .               .                          .
          .                        .                 .
          .                               .          .
q_0_cumulative(x_t | x_0 = C_{k-1\}) ... q_n_cumulative(x_t | x_0 = C_{k-1\})`}
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  Calculates the log probabilities of the rows from the (cumulative or non-cumulative) transition matrix