title: Scatterplot legend and fill not working in Octave
body: <p>I am using Octave.
  My problem is this: I want to fill the bubbles of my scatter plot, as well as place a legend. But I get errors when I try to use <code>'filled'</code>, and no legend comes up when I use <code>legend(...)</code>.
  Part of my code looks like this:</p>
  <pre><code>%ALL SAMPLES, PHI(Signal) @ THETA(Sample)=0
  figure(5)
  plot( Angles(:,1)([18:27]),  ALL([18:27]), 10, [1 0 1]);  %Magenta
  hold on 
  scatter(Angles(:,1)([68:76]), ALL([68:76]), 10, [0 0 0]);   %Black
  scatter(Angles(:,1)([86:95]), ALL([86:95]), 10, [1 0 0]);   %Red
  scatter(Angles(:,1)([119:127]), ALL([119:127]), 10, [0 1 0]);   %Green
  scatter(Angles(:,1)([133:141]), ALL([133:141]), 10, [0 0 1]);   %Blue
  hold off
  xlabel('Signal PMT angle (Sample angle at 0)'); 
  ylabel('Normalized (signal/monitor) intensity');
  legend('Control', 'Control', '1+2','Virgin','Cycle #1', 'Location','NorthEast');
  title('Plot of All Samples, &quot;-int Intensity&quot;')
  </code></pre>
  <p>I know it should be<code>plot( Angles(:,1)([18:27]),  ALL([18:27]), 10, [1 0 1], 'filled');</code>, but I receive errors when I do that. Also, a legend never seems to show up.</p>