Randomize the lines of a Sample

import openturns as ot

In this short example we present a simple way to mix the lines of a sample thanks to the KPermutationsDistribution class.

We first define a small sample of size based on a standard unit Gaussian distribution.

distribution = ot.Normal()
N = 5
sample = distribution.getSample(N)

We print the sample :

sample

	X0
0	0.6082017
1	-1.266173
2	-0.4382656
3	1.205478
4	-2.181385

A new set of randomly mixed indices is a realization of a permutation of elements amongst : This generates a random permutation of the integers .

mixingDistribution = ot.KPermutationsDistribution(N, N)
newIndices = mixingDistribution.getRealization()

The new indices will be these ones :

print("New indices : ", newIndices)

New indices :  [2,4,3,0,1]

Eventually the randomized sample is

print(sample[[int(i) for i in newIndices]])

    [ X0        ]
0 : [ -0.438266 ]
1 : [ -2.18139  ]
2 : [  1.20548  ]
3 : [  0.608202 ]
4 : [ -1.26617  ]