title: how can i change the lower bound using JuMP 0.19
body: <p>I have a variable <code>x</code> where its lower bound was defined as <code>lb=zeros(3)</code>, after that I want to change for each element of <code>lb</code> to be equal element of an array like <code>c=[1;2;1]</code> what I want exactly is to make <code>lb[i]=c[i] for i=1:length(c)</code> I used to do this in previous versions in the following way:</p>
  
  <pre><code>function setc(c)
          for i = 1:3
              m.linconstr[i].lb = float(c[i])
          end
      end
  </code></pre>
  
  <p>Of course where <code>m=Model(Clpsolver())</code></p>