how to supress very small scientific notations to zero?

Question

In sub-list of b the numbers are very close to zero , i wanted to make it equal to zeros if, they are >-1e-05.

is there is any better method ?


b = [[0.0, -2.220446049250313e-16, -8.881784197001252e-16, -6.661338147750939e-16, 0.0],
     [0.0, -0.1875000, -0.1250000, -0.0625000, 0.0], 
     [0.0, -0.125000, -0.25000, -0.1250, 0.0], 
     [0.0, -0.06250, -0.1250, -0.18750, 0.0], [0, 0, 0, 0, 0]]

for i in b:
    for j in i:
        if j > -1e-05:
            j = 0
        else:
            j = j

Asked By: walter white

||

Source

Answer 1

To do this, you can use numpy and np.where. First transform your list into an array:

import numpy as np

b = np.array(b)

Then use np.where to modify your array. The first argument is your condition, the second is the value you want your array to have when the condition is satisfied and the the third is the value you want your array to have when the condition is not satisfied:

>>> np.where(b>-10**(-5), 0, b)
array([[ 0.    ,  0.    ,  0.    ,  0.    ,  0.    ],
       [ 0.    , -0.1875, -0.125 , -0.0625,  0.    ],
       [ 0.    , -0.125 , -0.25  , -0.125 ,  0.    ],
       [ 0.    , -0.0625, -0.125 , -0.1875,  0.    ],
       [ 0.    ,  0.    ,  0.    ,  0.    ,  0.    ]])

Answered By: Romain Simon

Answer 2

Just do:

  import numpy as np
  np.round(b, 5)

Results in:

[[ 0.     -0.     -0.     -0.      0.    ]
 [ 0.     -0.1875 -0.125  -0.0625  0.    ]
 [ 0.     -0.125  -0.25   -0.125   0.    ]
 [ 0.     -0.0625 -0.125  -0.1875  0.    ]
 [ 0.      0.      0.      0.      0.    ]]

Answered By: Eelco van Vliet

how to supress very small scientific notations to zero?

Question:

Answers: