  Hi, I have a matrix:
  [,1] [,2]
  [1,] 11 31
  [2,] 44 50
  [3,] 23 100
  [4,] 90 31
  I use plot to draw the four points. Is there any way to label the point? for insatnce, for (11,31), it is "1", for (44,50), it is "4".
  Thanks!
   


		
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