title: Different colorbar in same plot
body: <p>A simple question. I have a figure. I need to hold it, and put some dots on it using scatter plot. Figure has a <code>colormap(jet)</code>. I want these new dots to be black. I tried using caxis.</p>
  
  <p>This is what I did:</p>
  
  <pre><code>cmap=colormap(jet);cmap=[[0;0;0]';cmap;[1;1;1]'];caxis([-pi pi]);colormap(cmap);
  </code></pre>
  
  <p>I set the values of new dots to 10 or -10. So they are black or white. But the lowest values or highest values in my original image is also black or white. Since the <code>caxis</code> works as less that or equal to basis. </p>
  
  <p>If you can suggest some other method, thats also fine.</p>
  
  <p>Thanks in advance.</p>
  
  <p>N</p>