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m = matrix([ [(-3/10), (1/5), (1/10)],
[(1/5), (-2/5), (2/5)],
[(1/10), (1/5), (-1/2)] ])

n = matrix([ [-0.3, 0.2, 0.1],
 [0.2, -0.4, 0.4],
 [0.1, 0.2, -0.5] ])

m
[-3/10 1/5 1/10] [ 1/5 -2/5 2/5] [ 1/10 1/5 -1/2] 
n
[-0.300000000000000 0.200000000000000 0.100000000000000] [ 0.200000000000000 -0.400000000000000 0.400000000000000] [ 0.100000000000000 0.200000000000000 -0.500000000000000] 
m.echelon_form()
[ 1 0 -3/2] [ 0 1 -7/4] [ 0 0 0] 
n.echelon_form()
[ 1.00000000000000 0.000000000000000 0.000000000000000] [0.000000000000000 1.00000000000000 0.000000000000000] [0.000000000000000 0.000000000000000 1.00000000000000] 
n.det()
1.04083408558608e-17 
n.det() == 0
False 
a = n.numpy()
import numpy
numpy.rank(a)
2 
numpy.rank(numpy.zeros((1,2,4)))
3