title: how to revise a existing cplex model in C++
body: <p>I have a very large LP problem to solve and have to solve it many times.</p>
  
  <p>Each time, I only need to change some coefficient and run again.</p>
  
  <p>So my strategy is to formulate model for the basic problem, and save it.</p>
  
  <p>Each time, I get a copy of the basic model, and try to change the coefficient.</p>
  
  <p>The problem is how can I change the coefficient for the new copy. </p>
  
  <p>I know how to change the coefficient when creating the model. But I dont want to repeat the creating process , since it costs a lot of time. </p>
  
  <p>Is there any direct method to change the coefficient without creating the model again?</p>