probability density function of the distribution
first derivative of f0
second derivative of f0
T_c family (single value or array)
non-overlapping partitioning with at most one inflection point per interval
efficiency of the Flex algorithm
maximal number of splitting points before Flex is aborted
Array of FlexInterval's.
Calculate the intervals for the Flex algorithm for a T_c family given its density function, the first two derivatives and a valid start partitioning. The Flex algorithm will try to split the intervals until a chosen efficiency rho is reached.