Note
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Add a trend to a processΒΆ
In this example we are going to add a trend to a process.
The TrendTransform class enables to create a new process Y from a process X (no hypothesis on X needed):
import openturns as ot
import openturns.viewer as viewer
from matplotlib import pylab as plt
ot.Log.Show(ot.Log.NONE)
Create a process
grid = ot.RegularGrid(0.0, 0.1, 10)
amplitude = [5.0]
scale = [0.2]
covModel = ot.ExponentialModel(scale, amplitude)
X = ot.GaussianProcess(covModel, grid)
Draw a sample
sample = X.getSample(6)
sample.setName("X")
graph = sample.drawMarginal(0)
view = viewer.View(graph)
Define a trend function
f = ot.SymbolicFunction(["t"], ["30*t"])
fTrend = ot.TrendTransform(f, grid)
Add it to the process
Y = ot.CompositeProcess(fTrend, X)
Y.setName("Y")
Draw a sample
sample = Y.getSample(6)
sample.setName("Y")
graph = sample.drawMarginal(0)
view = viewer.View(graph)
plt.show()