title: How to plot line in matlab with theta/rho data
body: <p>As title </p>
  
  <p>I only have the theta/rho data</p>
  
  <p>the line equation is</p>
  
  <pre><code>x*cos(theta)+y*sin(theta)=rho
  </code></pre>
  
  <p>how to plot line whith these data in matlab?</p>
  
  <p>are there any function which input are theta and rho?</p>
  
  <p>thanks</p>