Create a random vector

The RandomVector object represents the concept of random variable.

In this example we are going to exhibit some of its main methods.

import openturns as ot

ot.Log.Show(ot.Log.NONE)

Create a random vector

dist3d = ot.Normal(3)
X = ot.RandomVector(dist3d)

Get the dimension

X.getDimension()

3

Get the mean

X.getMean()

[0,0,0]

Get the covariance

X.getCovariance()

[[ 1 0 0 ]
[ 0 1 0 ]
[ 0 0 1 ]]

Draw a sample

X.getSample(5)

	X0	X1	X2
0	-0.3669958	1.4285	-1.908112
1	2.113194	-0.6656038	-0.1165616
2	1.078081	-0.5657817	-0.6800565
3	-0.1835751	0.768168	-2.496996
4	0.1510135	0.9669702	0.4488739

Extract a single component

X1 = X.getMarginal(1)
X1.getSample(5)

	X1
0	-0.05830888
1	1.596199
2	-0.9100232
3	0.2912405
4	0.3625414

Extract several components

X02 = X.getMarginal([0, 2])
X02.getSample(5)

	X0	X2
0	-0.7755861	-0.8029558
1	-1.348806	0.01705316
2	-1.728507	-0.2114691
3	0.6865244	0.2568323
4	0.5090324	0.4770067