# http://es.stackoverflow.com/q/21370/127
import numpy as np
A=np.array([[ 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]])
print A
A[A<=2] = 0
print A
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