r - Contour plot with 90 degree angles -
 I have a matrix, say  cmat & lt; - Matrix (c (0,0,1,0,1), 1,0,1,1), 3,3)  and with those  precise  I would like to plot shapes 
 The lines that I get when using a  contourplot (cmat) , instead of running tiles properly, instead of a type of "smooth" contour Defines what I want, a graph that is made of vertical and horizontal lines only. 
Do anyone know the function to do this?
Thanks in advance, Renzu
  
 
  
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