Matlab AMPL VariableInstance.unfix用法及代码示例

ampl.eval('var x<=3; var y{1..3}<=4;');
  ampl.eval('maximize z: x + sum{i in 1..3} y[i];');
  x = ampl.getVariable('x');
  y = ampl.getVariable('y');
  x.fix(1);         % fix variables
  y.get(2).fix(2);
  ampl.solve; % solve
  x.display   % display solution
  y.display
  x.unfix;    % unfix variables
  y.unfix;
  ampl.solve; % solve and display
  x.display   % display solution
  y.display

gives::

  ans =
     x = 1

  ans =
     y [*] :=
     1  4
     2  2
     3  4
     ;

  ans =
     x = 3

  ans =
     y [*] :=
     1  4
     2  4
     3  4
     ;