OptimizationProblem-class: Optimization problem class

In prioritizr: Systematic Conservation Prioritization in R

Optimization problem class

Description

This class is used to represent an optimization problem. It stores the information needed to generate a solution using an exact algorithm solver. Most users should use compile() to generate new optimization problem objects, and the functions distributed with the package to interact with them (e.g., base::as.list()). Only experts should use the fields and methods for this class directly.

Public fields

ptr

A Rcpp::Xptr external pointer. Create a new optimization problem object.

Methods

Public methods

• OptimizationProblem$new()

• OptimizationProblem$print()

• OptimizationProblem$show()

• OptimizationProblem$ncol()

• OptimizationProblem$nrow()

• OptimizationProblem$ncell()

• OptimizationProblem$modelsense()

• OptimizationProblem$vtype()

• OptimizationProblem$obj()

• OptimizationProblem$A()

• OptimizationProblem$rhs()

• OptimizationProblem$sense()

• OptimizationProblem$lb()

• OptimizationProblem$ub()

• OptimizationProblem$number_of_features()

• OptimizationProblem$number_of_planning_units()

• OptimizationProblem$number_of_zones()

• OptimizationProblem$col_ids()

• OptimizationProblem$row_ids()

• OptimizationProblem$compressed_formulation()

• OptimizationProblem$shuffle_columns()

• OptimizationProblem$copy()

• OptimizationProblem$clone()

---

Method new()

Usage

OptimizationProblem$new(ptr)

Arguments

ptr

Rcpp::Xptr external pointer.

Returns

A new OptimizationProblem object.

---

Method print()

Print concise information about the object.

Usage

OptimizationProblem$print()

Returns

Invisible TRUE.

---

Method show()

Print concise information about the object.

Usage

OptimizationProblem$show()

Returns

Invisible TRUE.

---

Method ncol()

Obtain the number of columns in the problem formulation.

Usage

OptimizationProblem$ncol()

Returns

A numeric value.

---

Method nrow()

Obtain the number of rows in the problem formulation.

Usage

OptimizationProblem$nrow()

Returns

A numeric value.

---

Method ncell()

Obtain the number of cells in the problem formulation.

Usage

OptimizationProblem$ncell()

Returns

A numeric value.

---

Method modelsense()

Obtain the model sense.

Usage

OptimizationProblem$modelsense()

Returns

A character value.

---

Method vtype()

Obtain the decision variable types.

Usage

OptimizationProblem$vtype()

Returns

A character vector.

---

Method obj()

Obtain the objective function.

Usage

OptimizationProblem$obj()

Returns

A numeric vector.

---

Method A()

Obtain the constraint matrix.

Usage

OptimizationProblem$A()

Returns

A Matrix::sparseMatrix() object.

---

Method rhs()

Obtain the right-hand-side constraint values.

Usage

OptimizationProblem$rhs()

Returns

A numeric vector.

---

Method sense()

Obtain the constraint senses.

Usage

OptimizationProblem$sense()

Returns

A character vector.

---

Method lb()

Obtain the lower bounds for the decision variables.

Usage

OptimizationProblem$lb()

Returns

A numeric vector.

---

Method ub()

Obtain the upper bounds for the decision variables.

Usage

OptimizationProblem$ub()

Returns

A numeric vector.

---

Method number_of_features()

Obtain the number of features.

Usage

OptimizationProblem$number_of_features()

Returns

A numeric value.

---

Method number_of_planning_units()

Obtain the number of planning units.

Usage

OptimizationProblem$number_of_planning_units()

Returns

A numeric value.

---

Method number_of_zones()

Obtain the number of zones.

Usage

OptimizationProblem$number_of_zones()

Returns

A numeric value.

---

Method col_ids()

Obtain the identifiers for the columns.

Usage

OptimizationProblem$col_ids()

Returns

A character value.

---

Method row_ids()

Obtain the identifiers for the rows.

Usage

OptimizationProblem$row_ids()

Returns

A character value.

---

Method compressed_formulation()

Is the problem formulation compressed?

Usage

OptimizationProblem$compressed_formulation()

Returns

A logical value.

---

Method shuffle_columns()

Shuffle the order of the columns in the optimization problem.

Usage

OptimizationProblem$shuffle_columns(order)

Arguments

order

integer vector with new order.

Returns

An integer vector with indices to un-shuffle the problem.

---

Method copy()

Create a copy of the optimization problem.

Usage

OptimizationProblem$copy()

Returns

A new OptimizationProblem object .

---

Method clone()

The objects of this class are cloneable with this method.

Usage

OptimizationProblem$clone(deep = FALSE)

Arguments

deep

Whether to make a deep clone.

See Also

Other classes: ConservationModifier-class, ConservationProblem-class, Constraint-class, Decision-class, Objective-class, Penalty-class, Portfolio-class, Solver-class, Target-class

prioritizr documentation built on April 3, 2025, 8:45 p.m.