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Function for identifying predecessor periods #102
Description
The following function was introduced in EnergyModelsInvestment through PR 58, but not used as it was no longer necessary. It can however be a nice function to have within TimeStruct.
However, in this case, it would be beneficial to also include it for RepresentativePeriods and SimpleTimes (it is not relevant for OperationalScenarios as these are parallel). This issue is just to keep track of the developed code.
"""
_predecessor_periods(𝒯::TwoLevel)
_predecessor_periods(𝒯::TwoLevelTree)
Return a dictionary mapping each strategic period to the strategic periods preceding it on
the same scenario path. For a linear time structure, the predecessors are all earlier
strategic periods. For a tree structure, only ancestor periods on the corresponding path
are included.
"""
function _predecessor_periods(𝒯::TwoLevel)
sps = collect(strat_periods(𝒯))
return Dict(t_inv => sps[1:(idx-1)] for (idx, t_inv) ∈ enumerate(sps))
end
function _predecessor_periods(𝒯::TwoLevelTree)
sps_pre = Dict()
for scenario ∈ strategic_scenarios(𝒯)
path = collect(strat_periods(scenario))
for (idx, period) ∈ enumerate(path)
!haskey(sps_pre, period) && (sps_pre[period] = path[1:(idx-1)])
end
end
return sps_pre
end
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