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#! /usr/bin/env python
import openturns as ot
import openturns.testing as ott
from math import exp
ot.TESTPREAMBLE()
ot.Log.Show(ot.Log.ALL)
def test_solver(solver):
relEps = solver.getRelativeError()
absEps = solver.getAbsoluteError()
def test_f1(x):
y = exp(x[0]) - 1.9151695967140057e-174
return [y]
f1 = ot.PythonFunction(1, 1, test_f1)
root = solver.solve(f1, 0.0, -450.0, -350.0)
ott.assert_almost_equal(root, -400.0, relEps, absEps)
def test_f2(x):
y = exp(x[0]) - 5.221469689764144e173
return [y]
f2 = ot.PythonFunction(1, 1, test_f2)
root = solver.solve(f2, 0.0, 350.0, 450.0)
ott.assert_almost_equal(root, 400.0, relEps, absEps)
# 1) Bisection
algo = ot.Bisection()
test_solver(algo)
# 2) Brent
algo = ot.Brent()
test_solver(algo)
# 3) Secant
algo = ot.Secant()
test_solver(algo)
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