title: a better way to color many individual markers in a scatter chart?
body: <p>Friends,<br>
  My intention is to create an interactive chart that represents a portion of the table of isotopes, which you can see here, for example: <a href="http://www.nndc.bnl.gov/chart/" rel="nofollow">http://www.nndc.bnl.gov/chart/</a>.</p>
  
  <p>So: I have a 2-d graph with ~400 points. I want to color code the points after they're drawn according to the value of a piece of metadata I've included for each point. I might have ten shades of red, for example, and set it according to where the point's metadata value falls.</p>
  
  <p>As a test, I've tried to just color them all red, just to get the function call right.</p>
  
  <p>This is my problem: I've figured out how to do this using this code (placed in the chart load event):</p>
  
  <pre><code>for (var i = 0; i &lt; this.series[0].data.length; i++) {
                      this.series[1].points[i].update({
                          marker: {
                              fillColor: "#FF0000"
                          }
                      });
  </code></pre>
  
  <p>But I have found that using series.points.update() is <em>very very</em> slow. </p>
  
  <p>I've tried to access the marker property directly. I guess first from the API that I could write:
      <em>series[i].data[j].marker.fillColor="#FF0000"</em></p>
  
  <p>or maybe, judging by a bit of code I found in highcharts-more.js:
      <em>series[i].data[j].markerOptions.fillColor="#FF0000"</em></p>
  
  <p>But I see now that the API lists direct calls to marker under 'initial configuration options', and there is no direct call under  'methods and properties'.</p>
  
  <p>My question then: is there a fast way to set the marker color for hundreds of points after the chart is drawn? Or can I somehow change it faster before the chart is drawn? </p>
  
  <p>For what it's worth, my code is here: <a href="http://jsfiddle.net/mattmcg/bn35f/13/" rel="nofollow">http://jsfiddle.net/mattmcg/bn35f/13/</a><br>
  Very long, but the relevant parts are right in lines 5-14.</p>
  
  <p>thanks! </p>