Adding random values to python list elements-CodePudding

I have a list :

a = [1,2,3,4,5,6,7,8,9,10]

I want to add a different random number to each element in the list using np.random.randn() I start by creating another list containing the rando values by using:

noise = []
for i in range(len(a)):
    b = (random_noise * np.random.randn())
    noise.append(b)

And the add the two lists

a   b

My question is, is there a simplified method in which i can add the noise directly to a elements without the need to creating the loop, in seek of saving time in the large problems.

CodePudding user response：

If you turn a into a numpy array, you can do

>>> a = np.array(a)
>>> a2 = a   np.random.randn(a.size)
>>> a2
array([-0.1199694 ,  1.64558727,  3.10977101,  5.66627737,  4.95481395,
        7.63834891,  7.48148948,  8.55867759,  8.02858298,  9.77297563])

CodePudding user response：

Create the noise as np array and add it to a

import numpy as np
a = [1,2,3,4,5,6,7,8,9,10]
noise = np.random.randn(len(a))
print(a noise)

CodePudding user response：

You can do something like this:

a = [x   np.random.randn() for x in range(1, 10)]
print(a)

output:

[0.31328085156307206, 0.8473128208005949, 4.574220370196114, 3.7338991251803195, 4.9131070198281686, 5.4760389038550565, 7.328982658187497, 6.716468468134682, 9.491303138695487]