next up previous index
Next: The Estimate Method Up: Development Project Location Choice Previous: Initialization   Index

The Run Method

Input:
It takes the same arguments as the run() method of its parent:
specification, coefficients, agent_set, agents_index, chunk_specification, data_objects, and run_config.

The agent_set is expected to be an instance of DevelopmentProjectDataset. It is assumed that initially all projects are unplaced.

Algorithm:
The model must be set to use capacity (via entries ``compute_capacity_flag'' and ``capacity_string'' in run_config). The capacity attribute is considered as a variable that is 1 for locations that are developable for this particular project type, otherwise 0. This means that no more than one project of the same type can occupy one location. The method determine_units_capacity() assures that locations taken in previous chunks are marked as taken.

The weight array for sampling is constructed in each chunk by combining information about project sizes and minimum and maximum developable units in each location. Thus, the weight array is a 2-d array which implies that different projects have different weights for the same locations, depending on their size. The dimension of the location axis of this array is for memory reasons reduced to only locations that are developable. No additional filtering is done (the model sets the class property filter to None).

The class overwrites its parent's method get_agents_order() in a way that it sorts the agents according to their sizes in descending order. This means that larger projects enter the choice process first.

The run() method proceeds otherwise as defined in the parent class.

Output
It returns results of its parent class.


next up previous index
Next: The Estimate Method Up: Development Project Location Choice Previous: Initialization   Index
info (at) urbansim.org