Class: MIPPeR::Model

Inherits:
Object
  • Object
show all
Defined in:
lib/mipper/model.rb

Direct Known Subclasses

CbcModel, GLPKModel, GurobiModel, LPSolveModel

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Model 



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# File 'lib/mipper/model.rb', line 5

def initialize
  @sense = :min

  @variables = []
  @constraints = []

  @pending_variables = []
  @pending_constraints = []
end

Instance Attribute Details

#constraints ⇒ Object (readonly)

Returns the value of attribute constraints.



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# File 'lib/mipper/model.rb', line 3

def constraints
  @constraints
end

#variables ⇒ Object (readonly)

Returns the value of attribute variables.



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# File 'lib/mipper/model.rb', line 3

def variables
  @variables
end

Instance Method Details

#<<(obj) ⇒ Object

Add new objects (variables and constraints) to the model



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# File 'lib/mipper/model.rb', line 16

def <<(obj)
  case obj
  when Variable
    @pending_variables << obj
  when Constraint
    @pending_constraints << obj
  else
    fail TypeError
  end
end

#compute_IIS ⇒ Object

Compute an irreducible inconsistent subsytem for the model



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# File 'lib/mipper/model.rb', line 70

def compute_IIS
  fail NotImplementedError
end

#objective_value ⇒ Object

The value of the objective function



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# File 'lib/mipper/model.rb', line 75

def objective_value
  fail NotImplementedError
end

#optimize ⇒ Object

Optimize the model



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# File 'lib/mipper/model.rb', line 60

def optimize
  fail NotImplementedError
end

#sense=(sense) ⇒ Object

Set the sense of the model



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# File 'lib/mipper/model.rb', line 55

def sense=(sense)
  fail NotImplementedError
end

#status ⇒ Object

Get the status of the model



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# File 'lib/mipper/model.rb', line 65

def status
  :unknown
end

#update ⇒ Object

Update the model



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# File 'lib/mipper/model.rb', line 28

def update
  if @pending_variables.length == 1
    add_variable @pending_variables.first
  elsif @pending_variables.length > 0
    add_variables @pending_variables
  end
  @pending_variables = []

  if @pending_constraints.length == 1
    add_constraint @pending_constraints.first
  elsif @pending_constraints.length > 0
    add_constraints @pending_constraints
  end
  @pending_constraints = []
end

#write_lp(filename) ⇒ Object

Write the model to a file in CPLEX LP format



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# File 'lib/mipper/model.rb', line 45

def write_lp(filename)
  fail NotImplementedError
end

#write_mps(filename) ⇒ Object

Write the model to a file in MPS format



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# File 'lib/mipper/model.rb', line 50

def write_mps(filename)
  fail NotImplementedError
end