Class: OPL::Helper

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

Class Method Summary collapse

Class Method Details

.add_ones(text, lp) ⇒ Object 



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# File 'lib/opl.rb', line 177

def self.add_ones(text, lp)
  equation = text
  equation = "#"+equation
  equation.scan(/[#+-][a-z]/).each do |p|
    if p.include?("+")
      q = p.gsub("+", "+1*")
    elsif p.include?("-")
      q = p.gsub("-","-1*")
    elsif p.include?("#")
      q = p.gsub("#","#1*")
    end
    equation = equation.gsub(p,q)
  end
  equation.gsub("#","")
end

.check_options_syntax(options) ⇒ Object 



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# File 'lib/opl.rb', line 648

def self.check_options_syntax(options)
  return if options.empty?
  options.each do |option|
    if option.include?(":")
      title = option.gsub(" ","").split(":")[0]
      value = option.gsub(" ","").split(":")[1]
      if !["nonnegative", "integer", "boolean", "data", "epsilon"].include?(title.downcase)
        raise "Did not recognize the TITLE parameter '#{title}' in the options."
      end
    else
      raise "Options parameter '#{option}' does not have a colon in it. The proper syntax of an option is TITLE: VALUE"
    end
  end
end

.coefficients(text, lp) ⇒ Object

text is one side of the equation



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# File 'lib/opl.rb', line 294

def self.coefficients(text, lp)#text is one side of the equation
  equation = self.add_ones(text, lp)
  if equation[0]=="-"
    equation.scan(/[+-][\d\.]+/)
  else
    ("#"+equation).scan(/[#+-][\d\.]+/).map{|e|e.gsub("#","+")}
  end
end

.data_coefficients ⇒ Object 



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# File 'lib/opl.rb', line 303

def self.data_coefficients

end

.either_or(lp, constraint1, constraint2, i) ⇒ Object 



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# File 'lib/opl.rb', line 729

def self.either_or(lp, constraint1, constraint2, i)
  # in: lp, "10.0*x1+4.0*x2+5.0*x3<=600", "2.0*x1+2.0*x2+6.0*x3<=300"
  # out: "10.0*x1+4.0*x2+5.0*x3<=600+#{$default_m}", "2.0*x1+2.0*x2+6.0*x3<=300+#{$default_m}"
  index1 = lp.constraints.index(constraint1)
  lp.constraints[index1] = lp.constraints[index1]+"#{$default_m}*m[#{i}]"
  # add "+M[n]y[n]" to the rhs of the constraint
end

.forall(text) ⇒ Object 



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# File 'lib/opl.rb', line 90

def self.forall(text)
  #in: "i in (0..2), x[i] <= 5"
  #out: ["x[0] <= 5", "x[1] <= 5", "x[2] <= 5"]
  helper = self
  text = text.sub_paren_with_array
  if ((text.gsub(" ","")).scan(/\]\,/).size) + ((text.gsub(" ","")).scan(/\)\,/).size) != text.gsub(" ","").scan(/in/).size
    raise "The following forall() constraint is incorrectly formatted: #{text}. Please see the examples in test.rb for forall() constraints. I suspect you are missing a comma somewhere."
  end
  final_constraints = []
  if text.include?("sum")
    indices = text.split("sum")[0].scan(/[a-z] in/).map{|sc|sc[0]}
    values = text.split("sum")[0].scan(/\s\[[\-\s\d+,]+\]/).map{|e|e.gsub(" ", "").scan(/[\-\d]+/)}
  else
    indices = text.scan(/[a-z] in/).map{|sc|sc[0]}
    values = text.scan(/\s\[[\-\s\d+,]+\]/).map{|e|e.gsub(" ", "").scan(/[\-\d]+/)}
  end
  #TODO: the indices and values should only be those
    #of the forall(), not of any sum() that is
    #inside the forall()
  index_value_pairs = indices.zip(values)
  variable = text.scan(/[a-z]\[/)[0].gsub("[","")
  value_combinations = helper.mass_product(values)
  value_combinations.each_index do |vc_index|
    value_combination = value_combinations[vc_index]
    value_combination = [value_combination] unless value_combination.is_a?(Array)
    if text.include?("sum")
      constraint = "sum"+text.split("sum")[1..-1].join("sum")
    else
      constraint = text.split(",")[-1].gsub(" ","")
    end
    e = constraint
    value_combination.each_index do |i|
      index = indices[i]
      value = value_combination[i]
      e = e.gsub("("+index, "("+value)
      e = e.gsub(index+")", value+")")
      e = e.gsub("["+index, "["+value)
      e = e.gsub(index+"]", value+"]")
      e = e.gsub("=>"+index, "=>"+value)
      e = e.gsub("<="+index, "<="+value)
      e = e.gsub(">"+index, ">"+value)
      e = e.gsub("<"+index, "<"+value)
      e = e.gsub("="+index, "="+value)
      e = e.gsub("=> "+index, "=> "+value)
      e = e.gsub("<= "+index, "<= "+value)
      e = e.gsub("> "+index, "> "+value)
      e = e.gsub("< "+index, "< "+value)
      e = e.gsub("= "+index, "= "+value)
    end
    final_constraints += [e]
  end
  final_constraints
end

.get_all_vars(constraints, lp) ⇒ Object 



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# File 'lib/opl.rb', line 316

def self.get_all_vars(constraints, lp)
  all_vars = []
  constraints.each do |constraint|
    constraint = constraint.gsub(" ", "")
    value = constraint.split(":")[1] || constraint
    all_vars << self.variables(value, lp)
  end
  all_vars.flatten.uniq
end

.get_coefficient_variable_pairs(text) ⇒ Object 



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# File 'lib/opl.rb', line 404

def self.get_coefficient_variable_pairs(text)
  text.scan(/\d*[\*]*[a-z]\[*\d*\]*/)
end

.get_column_bounds(bound_info, all_variables) ⇒ Object 



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# File 'lib/opl.rb', line 539

def self.get_column_bounds(bound_info, all_variables)
  #in: ["NONNEGATIVE: x1"]
  #out: {:x1 => {:lower => 0}}
  column_bounds = {}
  bound_info.each do |info|
    type = info.gsub(" ","").split(":")[0]
    if type.downcase == "nonnegative"
      bounds = {:lower => 0}
    end
    variables = info.split(":")[1].gsub(" ","").split(",")
    variables.each do |root_var|
      all_variables_with_root = all_variables.find_all{|var|var.include?("[") && var.split("[")[0]==root_var}+[root_var]
      all_variables_with_root.each do |var|
        column_bounds[var.to_sym] = bounds
      end
    end
  end
  column_bounds
end

.get_constants(text) ⇒ Object 



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# File 'lib/opl.rb', line 326

def self.get_constants(text)
  #in: "-8 + x + y + 3"
  #out: "[-8, +3]"
  text = text.gsub(" ","")
  text = text+"#"
  cs = []
  potential_constants = text.scan(/[\d\.]+[^a-z^\[^\]^\d^\.^\)^\*]/)
  constants = potential_constants.find_all{|c|![*('a'..'z'),*('A'..'Z'),"["].include?(text[text.index(c)-1])}
  searchable_text = text
  constants.each_index do |i|
    constant = constants[i]
    c = constant.scan(/[\d\.]+/)[0]
    index = searchable_text.index(constant)
    if index == 0
      c = "+"+c
    else
      constant = constant.gsub('+','[+]')
      constant = constant.gsub('-','[-]')
      c = searchable_text.scan(/[\-\+]#{constant}/)[0]
    end
    cs << c.scan(/[\-\+][\d\.]+/)[0]
    searchable_text[index] = "**"
  end
  return({:formatted => cs, :unformatted => constants})
end

.mass_product(array_of_arrays, base = []) ⇒ Object 



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# File 'lib/opl.rb', line 79

def self.mass_product(array_of_arrays, base=[])
  return(base) if array_of_arrays.empty?
  array = array_of_arrays[0]
  new_array_of_arrays = array_of_arrays[1..-1]
  if base==[]
    self.mass_product(new_array_of_arrays, array)
  else
    self.mass_product(new_array_of_arrays, base.product(array).map{|e|e.flatten})
  end
end

.negate(text, explicit = false) ⇒ Object 



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# File 'lib/opl.rb', line 663

def self.negate(text, explicit=false)
  # text is one side of an equation
  # there will be no foralls, no sums, and no abs
  # in: "z - 3"
  # out: "-z + 3"
  working_text = text = text.gsub(" ","")
  #!("a".."z").to_a.include?(text[0]) && 
  if !["-","+"].include?(text[0])
    working_text = "+"+working_text
  end
  indices_of_negatives = working_text.index_array("-")
  indices_of_positives = working_text.index_array("+")
  indices_of_negatives.each {|i| working_text[i] = "+"}
  indices_of_positives.each {|i| working_text[i] = "-"}
  if !explicit && working_text[0] == "+"
    working_text = working_text[1..-1]
  end
  return(working_text)
end

.operator(constraint) ⇒ Object 



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# File 'lib/opl.rb', line 408

def self.operator(constraint)
  if constraint.include?(">=")
    ">="
  elsif constraint.include?("<=")
    "<="
  elsif constraint.include?(">")
    ">"
  elsif constraint.include?("<")
    "<"
  elsif constraint.include?("=")
    "="
  end
end

.parse_data(data_info) ⇒ Object 



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# File 'lib/opl.rb', line 559

def self.parse_data(data_info)
  #in: "DATA: {d => [1, 0.3, 1.5], o => [10.3, 4.0005, -1]}"
  #out: [data_object_1, data_object_2]
  data_hash_string = data_info.gsub(" ","").split(":")[1]
  data_string = data_hash_string.gsub("{",",").gsub("}",",")
  names = data_string.scan(/,[a-z]/).map{|comma_name|comma_name.gsub(",","")}
  string_values = data_string.scan(/\=\>[\[\d\.\]\,\-]+,/).map{|scanned_value|scanned_value[2..-2]}
  values = string_values.map{|sv|sv.to_a}
  data_hash = {}
  names.each_index do |i|
    name = names[i]
    value = values[i]
    value = value[0] if value.size == 1
    data_hash[name] = value
  end
  return(data_hash)
end

.produce_variable_type_hash(variable_types, all_variables) ⇒ Object 



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# File 'lib/opl.rb', line 486

def self.produce_variable_type_hash(variable_types, all_variables)
  #in: ["BOOLEAN: x, y", "INTEGER: z"]
  #out: {:x => 3, :y => 3, :z => 2}
  variable_type_hash = {}
  variable_types.each do |vt|
    type = vt.gsub(" ","").split(":")[0]
    if type.downcase == "boolean"
      type_number = 3
    elsif type.downcase == "integer"
      type_number = 2
    end
    variables = vt.split(":")[1].gsub(" ","").split(",")
    variables.each do |root_var|
      all_variables_with_root = all_variables.find_all{|var|var.include?("[") && var.split("[")[0]==root_var}+[root_var]
      all_variables_with_root.each do |var|
        variable_type_hash[var.to_sym] = type_number
      end
    end
  end
  variable_type_hash
end

.put_constants_on_rhs(text) ⇒ Object 



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# File 'lib/opl.rb', line 352

def self.put_constants_on_rhs(text)
  #in: "-8 + x + y + 3 <= 100"
  #out: "x + y <= 100 + 5"
  text = text.gsub(" ","")
  s = self.sides(text)
  constants_results = self.get_constants(s[:lhs])
  constants = []
  constants_results[:formatted].each_index do |i|
    formatted_constant = constants_results[:formatted][i]
    unformatted_constant = constants_results[:unformatted][i]
    unless unformatted_constant.include?("*")
      constants << formatted_constant
    end
  end
  unless constants.empty?
    sum = constants.map{|cc|cc.to_f}.inject("+").to_s
    if sum.include?("-")
      sum = sum.gsub("-","+")
    else
      sum = "-"+sum
    end
    lhs = s[:lhs].gsub(" ","")+"#"
    constants_results[:unformatted].each do |constant|
      index = lhs.index(constant)
      if index == 0
        lhs = lhs[(constant.size-1)..(lhs.size-1)]
      else
        lhs = lhs[0..(index-2)]+lhs[(index+(constant.size-1))..(lhs.size-1)]
      end
    end
    text = text.gsub(s[:lhs], lhs[0..-2])
    text += sum
  end
  return(text)
end

.put_variables_on_lhs(text) ⇒ Object 



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# File 'lib/opl.rb', line 422

def self.put_variables_on_lhs(text)
  #in: "x + y - x[3] <= 3z + 2x[2] - 10"
  #out: "x + y - x[3] - 3z - 2x[2] <= -10"
  text = text.gsub(" ", "")
  s = self.sides(text)
  oper = self.operator(text)
  rhs = s[:rhs]
  lhs = s[:lhs]
  coefficient_variable_pairs = self.get_coefficient_variable_pairs(rhs)
  add_to_left = []
  remove_from_right = []
  coefficient_variable_pairs.each do |cvp|
    index = rhs.index(cvp)
    if index == 0
      add_to_left << "-"+cvp
      remove_from_right << cvp
    else
      if rhs[index-1] == "+"
        add_to_left << "-"+cvp
        remove_from_right << "+"+cvp
      else
        add_to_left << "+"+cvp
        remove_from_right << "-"+cvp
      end
    end
  end
  new_lhs = lhs+add_to_left.join("")
  text = text.gsub(lhs+oper, new_lhs+oper)
  new_rhs = rhs
  remove_from_right.each do |rfr|
    new_rhs = new_rhs.gsub(rfr, "")
  end
  new_rhs = "0" if new_rhs == ""
  text = text.gsub(oper+rhs, oper+new_rhs)
  return(text)
end

.remove_constants(text) ⇒ Object 



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# File 'lib/opl.rb', line 613

def self.remove_constants(text)
  helper = self
  text = text.gsub(" ","")
  text = "+"+text if text[0]!="-"
  text = text+"#"
  constants = helper.get_constants(text)
  replacements = []
  constants[:formatted].each_index do |i|
    formatted = constants[:formatted][i]
    unformatted = constants[:unformatted][i]
    if formatted.include?("+")
      if unformatted.include?("+")
        replacements << ["+"+unformatted, "+"]
      elsif unformatted.include?("-")
        replacements << ["-"+unformatted, "-"]
      elsif unformatted.include?("#")
        replacements << [formatted+"#",""]
      end
    elsif formatted.include?("-")
      if unformatted.include?("+")
        replacements << ["-"+unformatted, "+"]
      elsif unformatted.include?("-")
        replacements << ["-"+unformatted, "-"]
      elsif unformatted.include?("#")
        replacements << [formatted+"#",""]
      end
    end
  end
  replacements.each do |replacement|
    text = text.gsub(replacement[0],replacement[1])
  end
  text = text[1..-1] if text[0] == "+"
  return(text)
end

.replace_absolute_value(text) ⇒ Object 



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# File 'lib/opl.rb', line 683

def self.replace_absolute_value(text)
  # text is a constraint
  # there will be no foralls and no sums
  # in: "abs(x) <= 1"
  # out: "x <= 1", "-x <= 1"
  # in: "4x + 3y - 6abs(z - 3) <= 4"
  # out: "4x + 3y - 6z + 18 <= 4", "4x + 3y + 6z - 18 <= 4"
  if text.include?("abs")
    helper = self
    constraints_to_delete = [text]
    text = text.gsub(" ","")
    constraints_to_delete << text
    working_text = "#"+text
    absolute_value_elements = working_text.scan(/[\-\+\#]\d*abs\([a-z\-\+\*\d\[\]]+\)/)
    constraints_to_add = []
    absolute_value_elements.each do |ave|
      ave = ave.gsub("#","")
      inside_value = ave.split("(")[1].split(")")[0]
      positive_ave = inside_value
      negative_ave = helper.negate(inside_value)
      if ave[0] == "-" || ave[1] == "-"
        positive_ave = helper.negate(positive_ave, true)
        negative_ave = helper.negate(negative_ave, true)
      elsif ave[0] == "+"
        positive_ave = "+"+positive_ave
      end
      positive_constraint = text.gsub(ave, positive_ave)
      negative_constraint = text.gsub(ave, negative_ave)
      constraints_to_add << positive_constraint
      constraints_to_add << negative_constraint
    end
    return {:constraints_to_delete => constraints_to_delete, :constraints_to_add => constraints_to_add}
  else
    return {:constraints_to_delete => [], :constraints_to_add => []}
  end
end

.sides(text) ⇒ Object 



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# File 'lib/opl.rb', line 160

def self.sides(text)
  equation = text
  if equation.include?("<=")
    char = "<="
  elsif equation.include?(">=")
    char = ">="
  elsif equation.include?("<")
    char = "<"
  elsif equation.include?(">")
    char = ">"
  elsif equation.include?("=")
    char = "="
  end
  sides = equation.split(char)
  {:lhs => sides[0], :rhs => sides[1]}
end

.split_equals(constraint) ⇒ Object 



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# File 'lib/opl.rb', line 459

def self.split_equals(constraint)
  [constraint.gsub("=", "<="), constraint.gsub("=", ">=")]
end

.split_equals_a(constraints) ⇒ Object 



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# File 'lib/opl.rb', line 463

def self.split_equals_a(constraints)
  constraints.map do |constraint|
    if (constraint.split("") & ["<=",">=","<",">"]).empty?
      self.split_equals(constraint)
    else
      constraint
    end
  end.flatten
end

.split_ors(lp, constraints) ⇒ Object

make a default OPTION that m is BOOLEAN



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# File 'lib/opl.rb', line 738

def self.split_ors(lp, constraints)
  # in: ["x <= 10", "y <= 24 or y + x <= 14"]
  # out: ["x <= 10", "y - 1000000000000.0*m[0] <= 24", "y + x - 1000000000000.0 + 1000000000000.0*m[0] <= 14"]

  # add m[i+1] to left side of constraints
end

.strip_abs(text) ⇒ Object 



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# File 'lib/opl.rb', line 720

def self.strip_abs(text)
  # in: "3 + abs(x[1] - y) + abs(x[3]) <= 3*abs(-x[2])"
  # out: {:positive => "3 + x[1] - y + x[3] <= -3*x[2]",
  #       :negative => "3 - x[1] + y - x[3] <= 3*x[2]"}
  text = text.gsub(" ","")
  working_text = "#"+text

end

.sub_forall(equation, indexvalues = {:indices => [], :values => []}) ⇒ Object 



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# File 'lib/opl.rb', line 144

def self.sub_forall(equation, indexvalues={:indices => [], :values => []})
  #in: "forall(i in (0..2), x[i] <= 5)"
  #out: ["x[0] <= 5", "x[1] <= 5", "x[2] <= 5"]
  return equation unless equation.include?("forall")
  foralls = (equation+"#").split("forall(").map{|ee|ee.split(")")[0..-2].join(")")}.find_all{|eee|eee!=""}
  constraints = []
  if foralls.empty?
    return(equation)
  else
    foralls.each do |text|
      constraints << self.forall(text)
    end
    return(constraints.flatten)
  end
end

.sub_rhs_with_summed_constants(constraint) ⇒ Object 



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# File 'lib/opl.rb', line 399

def self.sub_rhs_with_summed_constants(constraint)
  rhs = self.sides(constraint)[:rhs]
  constraint.gsub(rhs, self.sum_constants(rhs))
end

.sub_sum(equation, lp, indexvalues = {:indices => [], :values => []}) ⇒ Object 



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# File 'lib/opl.rb', line 259

def self.sub_sum(equation, lp, indexvalues={:indices => [], :values => []})
  #in: "sum(i in (0..3), x[i]) <= 100"
  #out: "x[0]+x[1]+x[2]+x[3] <= 100"
  if equation.include?("sum(")
    sums = (equation+"#").split("sum(").map{|ee|ee.split(")")[0..-2].join(")")}.find_all{|eee|eee!=""}.find_all{|eeee|!eeee.include?("forall")}
    sums.each do |text|
      e = text
      unless indexvalues[:indices].empty?
        indexvalues[:indices].each_index do |i|
          index = indexvalues[:indices][i]
          value = indexvalues[:values][i].to_s
          e = e.gsub("("+index, "("+value)
          e = e.gsub(index+")", value+")")
          e = e.gsub("["+index, "["+value)
          e = e.gsub(index+"]", value+"]")
          e = e.gsub("=>"+index, "=>"+value)
          e = e.gsub("<="+index, "<="+value)
          e = e.gsub(">"+index, ">"+value)
          e = e.gsub("<"+index, "<"+value)
          e = e.gsub("="+index, "="+value)
          e = e.gsub("=> "+index, "=> "+value)
          e = e.gsub("<= "+index, "<= "+value)
          e = e.gsub("> "+index, "> "+value)
          e = e.gsub("< "+index, "< "+value)
          e = e.gsub("= "+index, "= "+value)
        end
      end
      equation = equation.gsub(text, e)
      result = self.sum(text, lp)
      equation = equation.gsub("sum("+text+")", result)
    end
  end
  return(equation)
end

.substitute_data(text, lp) ⇒ Object 



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# File 'lib/opl.rb', line 577

def self.substitute_data(text, lp)
  helper = self
  potential_things_to_substitute = helper.variables(text, lp)
  data_names = lp.data.map{|d|d.name}
  things_to_substitute = {}
  data_values = {}
  lp.data.each do |data|
    dname = data.name
    dvalue = data.value
    targets = potential_things_to_substitute.find_all do |ptts|
      dname == ptts[0]
    end
    things_to_substitute[dname] = targets
    targets.each do |target|
      indices = target.scan(/\d+/).map{|ind|ind.to_i}
      indices = "" if indices.empty?
      if dvalue.is_a?(Array)
        value = dvalue.values_at_a(indices)
      else
        value = dvalue
      end
      data_values[dname+indices.to_s.gsub(",","][").gsub(" ","")] = value
    end
  end
  data_values.keys.each do |key|
    name = key
    value = data_values[key]
    text = text.gsub(name, value.to_s)
  end
  plus_minus = text.scan(/\+[\ ]+-/)
  plus_minus.each do |pm|
    text = text.gsub(pm,"-")
  end
  return(text)
end

.sum(text, lp, indexvalues = {:indices => [], :values => []}) ⇒ Object 



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# File 'lib/opl.rb', line 193

def self.sum(text, lp, indexvalues={:indices => [], :values => []})
  #in: "i in [0,1], j in [4,-5], 3x[i][j]"
  #out: "3x[0][4] + 3x[0][-5] + 3x[1][4] + 3x[1][-5]"
  text = text.sub_paren_with_array
  if text.scan(/\(\d+\+\d+\)/).size > 0
    text.scan(/\(\d+\+\d+\)/).each {|e| text = text.gsub(e,eval(e.gsub("(","").gsub(")","")).to_s) }
  end
  text = text.sub_paren_with_array
  if (text.gsub(" ","")).scan(/\]\,/).size != text.scan(/in/).size
    raise "The following sum() constraint is incorrectly formatted: #{text}. Please see the examples in test.rb for sum() constraints. I suspect you are missing a comma somewhere."
  elsif (text.gsub(" ","").include?("=") || text.gsub(" ","").include?("<") || text.gsub(" ","").include?(">"))
    raise "The following sum() constraint cannot have a equalities in it (a.k.a. =, <, >): #{text}"
  end
  final_text = ""
  element = text.split(",")[-1].gsub(" ","")
  indices = text.scan(/[a-z] in/).map{|sc|sc[0]}
  input_indices = indexvalues[:indices] - indices
  if not input_indices.empty?
    input_values = input_indices.map{|ii|indexvalues[:values][indexvalues[:indices].index(ii)]}
  else
    input_values = []
  end
  values = text.scan(/\s\[[\-\s\d+,]+\]/).map{|e|e.gsub(" ", "").scan(/[\-\d]+/)}
  indices += input_indices
  values += input_values
  index_value_pairs = indices.zip(values)
  variable = text.scan(/[a-z]\[/)[0].gsub("[","")
  coefficient_a = text.split(",")[-1].split("[")[0].scan(/\-?[\d\*]+[a-z]/)
  if coefficient_a.empty?
    if text.split(",")[-1].split("[")[0].include?("-")
      coefficient = "-1"
    else
      coefficient = "1"
    end
  else
    coefficient = coefficient_a[0].scan(/[\d\-]+/)
  end
  value_combinations = OPL::Helper.mass_product(values)
  value_combinations.each_index do |vc_index|
    value_combination = value_combinations[vc_index]
    e = element
    value_combination = [value_combination] unless value_combination.is_a?(Array)
    value_combination.each_index do |i|
      index = indices[i]
      value = value_combination[i]
      e = e.gsub("("+index, "("+value)
      e = e.gsub(index+")", value+")")
      e = e.gsub("["+index, "["+value)
      e = e.gsub(index+"]", value+"]")
      e = e.gsub("=>"+index, "=>"+value)
      e = e.gsub("<="+index, "<="+value)
      e = e.gsub(">"+index, ">"+value)
      e = e.gsub("<"+index, "<"+value)
      e = e.gsub("="+index, "="+value)
      e = e.gsub("=> "+index, "=> "+value)
      e = e.gsub("<= "+index, "<= "+value)
      e = e.gsub("> "+index, "> "+value)
      e = e.gsub("< "+index, "< "+value)
      e = e.gsub("= "+index, "= "+value)
    end
    e = "+"+e unless (coefficient.include?("-") || vc_index==0)
    final_text += e
  end
  final_text
end

.sum_constants(text) ⇒ Object 



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# File 'lib/opl.rb', line 388

def self.sum_constants(text)
  #in: "100+ 10-3"
  #out: "107"
  constants = self.get_constants(text)[:formatted]
  if constants.to_s.include?(".")
    constants.map{|c|c.to_f}.inject("+").to_s
  else
    constants.map{|c|c.to_i}.inject("+").to_s
  end
end

.sum_indices(constraint) ⇒ Object 



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# File 'lib/opl.rb', line 473

def self.sum_indices(constraint)
  # pieces_to_sub = constraint.scan(/[a-z]\[\d[\d\+\-]+\]/)
  # pieces_to_sub = constraint.scan(/[a-z\]]\[\d[\d\+\-]+\]/)
  pieces_to_sub = constraint.scan(/\[[\d\+\-]+\]/)
  pieces_to_sub.each do |piece|
    characters_to_sum = piece.scan(/[\d\+\-]+/)[0]
    index_sum = self.sum_constants(characters_to_sum)
    new_piece = piece.gsub(characters_to_sum, index_sum)
    constraint = constraint.gsub(piece, new_piece)
  end
  return(constraint)
end

.sum_variables(formatted_constraint, lp) ⇒ Object 



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# File 'lib/opl.rb', line 508

def self.sum_variables(formatted_constraint, lp)
  #in: x + y - z + x[3] + z + y - z + x - y <= 0
  #out: 2*x + y - z + x[3] <= 0
  helper = self
  lhs = helper.sides(formatted_constraint)[:lhs]
  formatted_lhs = helper.add_ones(lhs, lp)
  vars = helper.variables(formatted_lhs, lp)
  coefs = helper.coefficients(formatted_lhs, lp)
  var_coef_hash = {}
  vars.each_index do |i|
    var = vars[i]
    coef = coefs[i]
    if var_coef_hash[var]
      var_coef_hash[var] += coefs[i].to_f
    else
      var_coef_hash[var] = coefs[i].to_f
    end
  end
  new_lhs = ""
  var_coef_hash.keys.each do |key|
    coef = var_coef_hash[key].to_s
    var = key
    coef = "+"+coef unless coef.include?("-")
    new_lhs += coef+"*"+var
  end
  if new_lhs[0] == "+"
    new_lhs = new_lhs[1..-1]
  end
  formatted_constraint.gsub(lhs, new_lhs)
end

.variables(text, lp) ⇒ Object

parameter is one side of the equation



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# File 'lib/opl.rb', line 307

def self.variables(text, lp)#parameter is one side of the equation
  text = self.add_ones(text, lp)
  text = text.gsub("abs","").gsub("(","").gsub(")","")
  variables = text.scan(/[a-z][\[\]\d]*/)
  raise("The variable letter a is reserved for special processes. Please rename your variable to something other than a.") if variables.join.include?("a")
  raise("The variable letter m is reserved for special processes. Please rename your variable to something other than m.") if variables.join.include?("m")
  return variables
end