Module: Rulp

Extended by:
Log
Defined in:
lib/rulp/rulp.rb,
lib/helpers/log.rb,
lib/rulp/rulp_bounds.rb,
lib/rulp/rulp_initializers.rb

Defined Under Namespace

Modules: Bounds, Initializers, Log Classes: Problem

Constant Summary collapse

MIN = 
"Minimize"
MAX = 
"Maximize"
GLPK = 
::GLPK
GUROBI = 
::GUROBI
SCIP = 
::SCIP
CBC = 
::CBC
SOLVERS = 
{
  GLPK     => Glpk,
  SCIP     => Scip,
  CBC      => Cbc,
  GUROBI   => Gurobi,
}

Instance Attribute Summary collapse

Class Method Summary collapse

Methods included from Log

log, log_level, log_level=, logger, logger=, print_solver_outputs, print_solver_outputs=

Instance Attribute Details

#expressions ⇒ Object

Returns the value of attribute expressions.



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# File 'lib/rulp/rulp.rb', line 21

def expressions
  @expressions
end

Class Method Details

.Cbc(lp, opts = {}) ⇒ Object 



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# File 'lib/rulp/rulp.rb', line 45

def self.Cbc(lp, opts={})
  lp.solve_with(CBC, opts)
end

.exec(command) ⇒ Object 



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# File 'lib/rulp/rulp.rb', line 74

def self.exec(command)
  result = ""
  Open3.popen2e("#{command} #{Rulp.print_solver_outputs ? "" : "> /dev/null 2>&1"}") do | inp, out, thr|
    out.each do |line|
      Rulp.log(Logger::DEBUG, line)
      result << line
    end
  end
  return result
end

.Glpk(lp, opts = {}) ⇒ Object 



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# File 'lib/rulp/rulp.rb', line 41

def self.Glpk(lp, opts={})
  lp.solve_with(GLPK, opts)
end

.Gurobi(lp, opts = {}) ⇒ Object 



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# File 'lib/rulp/rulp.rb', line 53

def self.Gurobi(lp, opts={})
  lp.solve_with(GUROBI, opts)
end

.Max(objective_expression) ⇒ Object 



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# File 'lib/rulp/rulp.rb', line 57

def self.Max(objective_expression)
  Rulp.log(Logger::INFO, "Creating maximization problem")
  Problem.new(Rulp::MAX, objective_expression)
end

.Min(objective_expression) ⇒ Object 



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# File 'lib/rulp/rulp.rb', line 62

def self.Min(objective_expression)
  Rulp.log(Logger::INFO, "Creating minimization problem")
  Problem.new(Rulp::MIN, objective_expression)
end

.Scip(lp, opts = {}) ⇒ Object 



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# File 'lib/rulp/rulp.rb', line 49

def self.Scip(lp, opts={})
  lp.solve_with(SCIP, opts)
end

.solver_exists?(solver_name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rulp/rulp.rb', line 67

def self.solver_exists?(solver_name)
  solver = solver_name[0].upcase + solver_name[1..-1].downcase
  solver_class = ObjectSpace.const_defined?(solver) && ObjectSpace.const_get(solver)
  solver_class.exists? if(solver_class)
end