constraints {oppr}

Project prioritization problem constraints

Description

A constraint can be added to a project prioritization problem() to ensure that solutions exhibit a specific characteristic.

Details

The following constraints can be added to a project prioritization problem():

add_locked_in_constraints()

Add constraints to ensure that certain actions are prioritized for funding.

add_locked_out_constraints()

Add constraints to ensure that certain actions are not prioritized for funding.

See Also

decisions, objectives, problem(), solvers, targets, weights.

Examples

# load data
data(sim_projects, sim_features, sim_actions)

# build problem with maximum richness objective and $150 budget
p1 <- problem(sim_projects, sim_actions, sim_features,
             "name", "success", "name", "cost", "name") %>%
     add_max_richness_objective(budget = 150) %>%
     add_binary_decisions()

# print problem
print(p1)

# build another problem, and lock in the third action
p2 <- p1 %>%
      add_locked_in_constraints(c(3))

# print problem
print(p2)

# build another problem, and lock out the second action
p3 <- p1 %>%
      add_locked_out_constraints(c(2))

# print problem
print(p3)

## Not run: 
# solve problems
s1 <- solve(p1)
s2 <- solve(p2)
s3 <- solve(p3)

# print the actions selected for funding in each of the solutions
print(s1[, sim_actions$name])
print(s2[, sim_actions$name])
print(s3[, sim_actions$name])

## End(Not run)