title: How do I change a single color in a colormap in Matlab?
body: <p>I've got a series of data in a regular x by z matrix that I am plotting using pcolor in Matlab. I am using the JET color map (flipped upside down) and would like to know how I can specify that when ever the parameter I am plotting has a value of 0, then the color should be white instead of the default dark red?</p>
  
  <p>My data is not filling out the entire matrix, so all cells without data are set to 0. This provides a plot which is semi-satisfactory as the contrast between the datafilled cells and the 0-cells is great enough that the area covered by the data is easily identified. However it would enhance the image greatly if all 0-cells where plotted in white.</p>
  
  <p>Best wishes
  ENOK</p>