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"""Tests for polyutils module.
"""
from __future__ import division
import numpy as np
import numpy.polynomial.polyutils as pu
from numpy.testing import *
from exceptions import TypeError, ValueError
class TestMisc(TestCase) :
def test_trimseq(self) :
for i in range(5) :
tgt = [1]
res = pu.trimseq([1] + [0]*5)
assert_equal(res, tgt)
def test_as_series(self) :
# check exceptions
assert_raises(ValueError, pu.as_series, [[]])
assert_raises(ValueError, pu.as_series, [[[1,2]]])
assert_raises(ValueError, pu.as_series, [[1],['a']])
# check common types
types = ['i', 'd', 'O']
for i in range(len(types)) :
for j in range(i) :
ci = np.ones(1, types[i])
cj = np.ones(1, types[j])
[resi, resj] = pu.as_series([ci, cj])
assert_(resi.dtype.char == resj.dtype.char)
assert_(resj.dtype.char == types[i])
def test_trimcoef(self) :
coef = [2, -1, 1, 0]
# Test exceptions
assert_raises(ValueError, pu.trimcoef, coef, -1)
# Test results
assert_equal(pu.trimcoef(coef), coef[:-1])
assert_equal(pu.trimcoef(coef, 1), coef[:-3])
assert_equal(pu.trimcoef(coef, 2), [0])
class TestDomain(TestCase) :
def test_getdomain(self) :
# test for real values
x = [1, 10, 3, -1]
tgt = [-1,10]
res = pu.getdomain(x)
assert_almost_equal(res, tgt)
# test for complex values
x = [1 + 1j, 1 - 1j, 0, 2]
tgt = [-1j, 2 + 1j]
res = pu.getdomain(x)
assert_almost_equal(res, tgt)
def test_mapdomain(self) :
# test for real values
dom1 = [0,4]
dom2 = [1,3]
tgt = dom2
res = pu. mapdomain(dom1, dom1, dom2)
assert_almost_equal(res, tgt)
# test for complex values
dom1 = [0 - 1j, 2 + 1j]
dom2 = [-2, 2]
tgt = dom2
res = pu.mapdomain(dom1, dom1, dom2)
assert_almost_equal(res, tgt)
def test_mapparms(self) :
# test for real values
dom1 = [0,4]
dom2 = [1,3]
tgt = [1, .5]
res = pu. mapparms(dom1, dom2)
assert_almost_equal(res, tgt)
# test for complex values
dom1 = [0 - 1j, 2 + 1j]
dom2 = [-2, 2]
tgt = [-1 + 1j, 1 - 1j]
res = pu.mapparms(dom1, dom2)
assert_almost_equal(res, tgt)
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