prioritizr (version 3.0.4)

add_cuts_portfolio: Add a Bender's cuts portfolio

Description

Generate a portfolio of solutions using Bender's cuts.

Usage

add_cuts_portfolio(x, number_solutions = 10L)

Arguments

x

ConservationProblem-class object.

number_solutions

integer number of attempts to generate different solutions. Defaults to 10.

Details

This strategy for generating a portfolio of solutions involves solving the problem multiple times and adding additional constraints to forbid previously obtained solutions. In general, this strategy is most useful when problems take a long time to solve and benefit from having multiple threads allocated for solving an individual problem.

See Also

portfolios.

Examples

# NOT RUN {
# load data
data(sim_pu_raster, sim_features)

# create problem
p <- problem(sim_pu_raster, sim_features) %>%
     add_min_set_objective() %>%
     add_relative_targets(0.1) %>%
     add_binary_decisions() %>%
     add_cuts_portfolio(10) %>%
     add_default_solver(gap = 0.2, verbose = FALSE)

# }
# NOT RUN {
# solve problem and generate 10 solutions within 20 % of optimality
s <- solve(p)

# plot solution
plot(s, axes = FALSE, box = FALSE)
# }
# NOT RUN {
# }