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"""Regression tests for optimize.
"""
from __future__ import division, print_function, absolute_import
import numpy as np
from numpy.testing import TestCase, run_module_suite, assert_almost_equal, \
assert_raises
import scipy.optimize
class TestRegression(TestCase):
def test_newton_x0_is_0(self):
# Regression test for gh-1601
tgt = 1
res = scipy.optimize.newton(lambda x: x - 1, 0)
assert_almost_equal(res, tgt)
def test_newton_integers(self):
# Regression test for gh-1741
root = scipy.optimize.newton(lambda x: x**2 - 1, x0=2,
fprime=lambda x: 2*x)
assert_almost_equal(root, 1.0)
def test_lmdif_errmsg(self):
# This shouldn't cause a crash on Python 3
class SomeError(Exception):
pass
counter = [0]
def func(x):
counter[0] += 1
if counter[0] < 3:
return x**2 - np.array([9, 10, 11])
else:
raise SomeError()
assert_raises(SomeError,
scipy.optimize.leastsq,
func, [1, 2, 3])
if __name__ == "__main__":
run_module_suite()
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