segmentation.OU.specialCase.same_shifts keeps the same shifts position,
and optimize the sum of costs using function
optimize_costs_given_shift_position.OU.specialCase.
segmentation.OU.specialCase.same_shifts(phylo, shifts_old, D, Xp, ...)a phylogenetic tree
the previous list of shifts (only position is used)
moments of the conditional law of X given Y, result
of function compute_M.OU.specialCase
the selection strength
List containing : beta_0 : the optimal value at the root shifts : list containing the computed tau and delta costs : vector of costs
This is the best move if keeping the previous shifts positions.