title: Concatenating histograms in MATLAB
body: <p>I am a new to MATLAB.  I have 6 histograms which are created from subdividing the image into patches.  How I can merge these patches to make one histogram (i.e. concatenating the 6 histograms)?</p>
  
  <p>I have tried this code:</p>
  
  <pre><code>subplot(3,4,1) 
  imhist(Patch1)
  subplot(3,4,2) 
  imhist(Patch2)
  subplot(3,4,3) 
  imhist(Patch3)
  subplot(3,4,4) 
  imhist(Patch4)
  </code></pre>