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  1. # http://es.stackoverflow.com/q/21370/127
  2. import numpy as np
  3.  
  4. A=np.array([[ 0., 0.1, 0.2, 0.3, 0.45],
  5. [ 1.2, 1.4, 1.6, 2.8, 3.92],
  6. [ 2.1, 1.8, 2.4, 2.2, 4.7 ],
  7. [ 3.2, 3.4, 5.1, 6.2, 5.22]])
  8.  
  9. print A
  10.  
  11. A[A<=2] = 0
  12. print A
Success #stdin #stdout 0.04s 25352KB
stdin
Standard input is empty
stdout
[[ 0.    0.1   0.2   0.3   0.45]
 [ 1.2   1.4   1.6   2.8   3.92]
 [ 2.1   1.8   2.4   2.2   4.7 ]
 [ 3.2   3.4   5.1   6.2   5.22]]
[[ 0.    0.    0.    0.    0.  ]
 [ 0.    0.    0.    2.8   3.92]
 [ 2.1   0.    2.4   2.2   4.7 ]
 [ 3.2   3.4   5.1   6.2   5.22]]