Determine which y values are on the boundaries and what the corresponding bounds of those y values are
bound_info(y_obs, dist, loop)matrix of observed distances (dimension: number of lines by number of years)
a list of the lengths for the corresponding lines
boolean which if true TRUE indicates that the lines
extend outward from a single point forming a circle and if
FALSE indicates that the lines are mapped along a fixed
contour such as a land boundary
list of 3 matrices each of dimension number of lines by number of
years giving the lower bound for hidden x values, the upper bound
for hidden x values, and an indicator of whether the
value is bounded at all. The values in the list are named
ub, lb, and xUnObs respectively.