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#! /usr/bin/env python
import openturns as ot
eps = 1e-2
# Instance creation
myFunc = ot.SymbolicFunction(
["x1", "x2"], ["x1*sin(x2)", "cos(x1+x2)", "(x2+1)*exp(x1-2*x2)"]
)
print("myFunc (before substitution) = ", repr(myFunc))
epsilon = ot.Point(myFunc.getInputDimension(), eps)
inPoint = ot.Point(epsilon.getDimension(), 1.0)
myGradient = ot.CenteredFiniteDifferenceGradient(epsilon, myFunc.getEvaluation())
print("myGradient=", repr(myGradient))
print("myFunc.gradient(", repr(inPoint), ")=", repr(myFunc.gradient(inPoint)))
print("myGradient.gradient(", repr(inPoint), ")=", repr(myGradient.gradient(inPoint)))
# Substitute the gradient
myFunc.setGradient(myGradient)
print("myFunc (after substitution) = ", repr(myFunc))
print(
"myFunc.gradient(",
repr(inPoint),
")=",
repr(myFunc.gradient(inPoint)),
" (after substitution)",
)
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