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In [3]:

    
import numpy as np









    Out[3]:





array([ 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11])



In [13]:

    
matrix = np.reshape(np.arange(12),(3,4))
type(matrix)









    Out[13]:





numpy.ndarray



In [12]:

    
matrix[matrix[:,0]>1]









    Out[12]:





array([[ 4,  5,  6,  7],
       [ 8,  9, 10, 11]])