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Remove top and right axes

set(gca, 'box', 'off')


Example

 subplot(1,2,1)

   plot([1,4,3,6,12,15],'.-')
   title('Standard plot')
 subplot(1,2,2)
   plot([1,4,3,6,12,15],'.-')
   set(gca, 'box', 'off')
   title('Top and right axes removed')





read more
http://www.mathworks.com/help/matlab/ref/axes-properties.html