title: netlogo: how to position turtles in certain location
body: <p>I want to position my turtles in a certain squared location. Why does this code below not work? Netlogo accepts it, but does not compile, saying "can't set turtle variable XCOR to non-number false" It should be pretty simple, but I somewhat can't get around it.</p>
  
  <pre><code>crt 50
  [
    set size 2
  
    set xcor xcor &gt;= 81 and xcor &lt;= 90 ;set initial location 
    set ycor ycor &gt;= 81 and ycor &lt;= 90 ;of turtles
    set start-patch patch-here
    pen-down
  ]  
  </code></pre>