Optimize_Second_Objective: Load and Optimize the second Objective Function

In paymanghasemi/SiteOpt: SiteOpt: an Open-source R-package for Site Selection Optimization in Conservation Planning

Load and Optimize the second Objective Function

Description

Optimize_Second_Objective loads the optimization problem and optimizes Second_Objective in Julia environment.

Usage

Optimize_Second_Objective(Time_limit=1e7, Solver="SCIP",
                                 Silence= FALSE, Env= .GlobalEnv)

Arguments

Time_limit	A double: the total time limit in seconds
Solver	A string: defining the solver to be used to solve the problem. (Default: "SCIP")
Silence	A binary parameter: if FALSE, the function will report a summary message. If TRUE, the function will be silent. (Default: FALSE)
Env	the environment where the package should create or access variables. By default the package works in the R's Global environment. (Default: .GlobalEnv)

Details

In the list that Optimize_Second_Objective returns, ⁠[["Status"]]⁠ defines the status of the returned solution.
If ⁠[["Status"]]="OPTIMAL"⁠, the problem was solved to optimality and the parcels' optimal status are stored in ⁠[["Result"]]⁠. Also, the optimal value will be stored in ⁠[["Objective_Value"]]⁠.
If ⁠[["Status"]]="TIME_LIMIT"⁠, the solver was terminated because the time limit was reached. If any feasible solution was reported by the solver, it would be stored in ⁠[["Result"]]⁠. Otherwise, ⁠[["Result"]]⁠ and ⁠[["Objective_Value"]]⁠ would be both equal to "N/A".
If ⁠[["Status"]]="INFEASIBLE"⁠, the problem is infeasible. So, no solution would be reported.

In any other case, the ⁠[["Status"]]⁠ will be the solution status that the solver has reported.

Value

A list with 5 members:
⁠[["Solution_time"]]⁠: a numeric value; defining the time spent in the solver in seconds.
⁠[["Status"]]⁠: a character; defining the status of the solution.
⁠[["Gap"]]⁠: a numeric value; defining the relative optimality gap of the solution.
⁠[["Result"]]⁠: a vector of binaries; its i'th element defines if the parcel named Parcels[i] is protected or not.Comparing these values with the values of Status defined when creating the problem, the user can find which parcels are to be invested, divested, or remain the same.
⁠[["Objective_Value"]]⁠: a numveric value; the returned value of Second objective.

See Also

Other Optimizer Functions: Load_Problem(), Optimize_First_Objective(), Optimize_NBP(), Optimize_WSO()

Other Second Objective: Second_Objective_Create(), Second_Objective_Import()

Examples

## Not run: 

Optimization_Result = Optimize_Second_Objective(Time_limit=1e7, Solver="SCIP")

## End(Not run)

paymanghasemi/SiteOpt documentation built on May 18, 2024, 2:06 p.m.