# insert code here




from numpy import random
from numpy import matrix

A = matrix( random.rand( 5,4 ) )

print( 'A before =' )
print( A )

Set_to_zero_unb_var1( A )

print( 'A after =' )
print( A )

#insert code here




from numpy import random
from numpy import matrix

A = matrix( random.rand( 5,4 ) )

print( 'A before =' )
print( A )

Set_to_zero_unb_var2( A )
print( 'A after =' )
print( A )