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""" Test functions for linalg module
"""
from numpy.testing import *
from numpy import array, single, double, csingle, cdouble, dot, identity
from numpy import multiply, atleast_2d, inf, asarray, matrix
from numpy import linalg
from numpy.linalg import matrix_power
def ifthen(a, b):
return not a or b
old_assert_almost_equal = assert_almost_equal
def imply(a, b):
return not a or b
def assert_almost_equal(a, b, **kw):
if asarray(a).dtype.type in (single, csingle):
decimal = 6
else:
decimal = 12
old_assert_almost_equal(a, b, decimal=decimal, **kw)
class LinalgTestCase:
def test_single(self):
a = array([[1.,2.], [3.,4.]], dtype=single)
b = array([2., 1.], dtype=single)
self.do(a, b)
def test_double(self):
a = array([[1.,2.], [3.,4.]], dtype=double)
b = array([2., 1.], dtype=double)
self.do(a, b)
def test_csingle(self):
a = array([[1.+2j,2+3j], [3+4j,4+5j]], dtype=csingle)
b = array([2.+1j, 1.+2j], dtype=csingle)
self.do(a, b)
def test_cdouble(self):
a = array([[1.+2j,2+3j], [3+4j,4+5j]], dtype=cdouble)
b = array([2.+1j, 1.+2j], dtype=cdouble)
self.do(a, b)
def test_empty(self):
a = atleast_2d(array([], dtype = double))
b = atleast_2d(array([], dtype = double))
try:
self.do(a, b)
raise AssertionError("%s should fail with empty matrices", self.__name__[5:])
except linalg.LinAlgError, e:
pass
def test_nonarray(self):
a = [[1,2], [3,4]]
b = [2, 1]
self.do(a,b)
def test_matrix_b_only(self):
"""Check that matrix type is preserved."""
a = array([[1.,2.], [3.,4.]])
b = matrix([2., 1.]).T
self.do(a, b)
def test_matrix_a_and_b(self):
"""Check that matrix type is preserved."""
a = matrix([[1.,2.], [3.,4.]])
b = matrix([2., 1.]).T
self.do(a, b)
class TestSolve(LinalgTestCase, TestCase):
def do(self, a, b):
x = linalg.solve(a, b)
assert_almost_equal(b, dot(a, x))
assert imply(isinstance(b, matrix), isinstance(x, matrix))
class TestInv(LinalgTestCase, TestCase):
def do(self, a, b):
a_inv = linalg.inv(a)
assert_almost_equal(dot(a, a_inv), identity(asarray(a).shape[0]))
assert imply(isinstance(a, matrix), isinstance(a_inv, matrix))
class TestEigvals(LinalgTestCase, TestCase):
def do(self, a, b):
ev = linalg.eigvals(a)
evalues, evectors = linalg.eig(a)
assert_almost_equal(ev, evalues)
class TestEig(LinalgTestCase, TestCase):
def do(self, a, b):
evalues, evectors = linalg.eig(a)
assert_almost_equal(dot(a, evectors), multiply(evectors, evalues))
assert imply(isinstance(a, matrix), isinstance(evectors, matrix))
class TestSVD(LinalgTestCase, TestCase):
def do(self, a, b):
u, s, vt = linalg.svd(a, 0)
assert_almost_equal(a, dot(multiply(u, s), vt))
assert imply(isinstance(a, matrix), isinstance(u, matrix))
assert imply(isinstance(a, matrix), isinstance(vt, matrix))
class TestCondSVD(LinalgTestCase, TestCase):
def do(self, a, b):
c = asarray(a) # a might be a matrix
s = linalg.svd(c, compute_uv=False)
old_assert_almost_equal(s[0]/s[-1], linalg.cond(a), decimal=5)
class TestCond2(LinalgTestCase, TestCase):
def do(self, a, b):
c = asarray(a) # a might be a matrix
s = linalg.svd(c, compute_uv=False)
old_assert_almost_equal(s[0]/s[-1], linalg.cond(a,2), decimal=5)
class TestCondInf(TestCase):
def test(self):
A = array([[1.,0,0],[0,-2.,0],[0,0,3.]])
assert_almost_equal(linalg.cond(A,inf),3.)
class TestPinv(LinalgTestCase, TestCase):
def do(self, a, b):
a_ginv = linalg.pinv(a)
assert_almost_equal(dot(a, a_ginv), identity(asarray(a).shape[0]))
assert imply(isinstance(a, matrix), isinstance(a_ginv, matrix))
class TestDet(LinalgTestCase, TestCase):
def do(self, a, b):
d = linalg.det(a)
if asarray(a).dtype.type in (single, double):
ad = asarray(a).astype(double)
else:
ad = asarray(a).astype(cdouble)
ev = linalg.eigvals(ad)
assert_almost_equal(d, multiply.reduce(ev))
class TestLstsq(LinalgTestCase, TestCase):
def do(self, a, b):
u, s, vt = linalg.svd(a, 0)
x, residuals, rank, sv = linalg.lstsq(a, b)
assert_almost_equal(b, dot(a, x))
assert_equal(rank, asarray(a).shape[0])
assert_almost_equal(sv, sv.__array_wrap__(s))
assert imply(isinstance(b, matrix), isinstance(x, matrix))
assert imply(isinstance(b, matrix), isinstance(residuals, matrix))
class TestMatrixPower(TestCase):
R90 = array([[0,1],[-1,0]])
Arb22 = array([[4,-7],[-2,10]])
noninv = array([[1,0],[0,0]])
arbfloat = array([[0.1,3.2],[1.2,0.7]])
large = identity(10)
t = large[1,:].copy()
large[1,:] = large[0,:]
large[0,:] = t
def test_large_power(self):
assert_equal(matrix_power(self.R90,2L**100+2**10+2**5+1),self.R90)
def test_large_power_trailing_zero(self):
assert_equal(matrix_power(self.R90,2L**100+2**10+2**5),identity(2))
def testip_zero(self):
def tz(M):
mz = matrix_power(M,0)
assert_equal(mz, identity(M.shape[0]))
assert_equal(mz.dtype, M.dtype)
for M in [self.Arb22, self.arbfloat, self.large]:
yield tz, M
def testip_one(self):
def tz(M):
mz = matrix_power(M,1)
assert_equal(mz, M)
assert_equal(mz.dtype, M.dtype)
for M in [self.Arb22, self.arbfloat, self.large]:
yield tz, M
def testip_two(self):
def tz(M):
mz = matrix_power(M,2)
assert_equal(mz, dot(M,M))
assert_equal(mz.dtype, M.dtype)
for M in [self.Arb22, self.arbfloat, self.large]:
yield tz, M
def testip_invert(self):
def tz(M):
mz = matrix_power(M,-1)
assert_almost_equal(identity(M.shape[0]), dot(mz,M))
for M in [self.R90, self.Arb22, self.arbfloat, self.large]:
yield tz, M
def test_invert_noninvertible(self):
import numpy.linalg
self.assertRaises(numpy.linalg.linalg.LinAlgError,
lambda: matrix_power(self.noninv,-1))
class TestBoolPower(TestCase):
def test_square(self):
A = array([[True,False],[True,True]])
assert_equal(matrix_power(A,2),A)
class HermitianTestCase(object):
def test_single(self):
a = array([[1.,2.], [2.,1.]], dtype=single)
self.do(a)
def test_double(self):
a = array([[1.,2.], [2.,1.]], dtype=double)
self.do(a)
def test_csingle(self):
a = array([[1.,2+3j], [2-3j,1]], dtype=csingle)
self.do(a)
def test_cdouble(self):
a = array([[1.,2+3j], [2-3j,1]], dtype=cdouble)
self.do(a)
def test_empty(self):
a = atleast_2d(array([], dtype = double))
assert_raises(linalg.LinAlgError, self.do, a)
def test_nonarray(self):
a = [[1,2], [2,1]]
self.do(a)
def test_matrix_b_only(self):
"""Check that matrix type is preserved."""
a = array([[1.,2.], [2.,1.]])
self.do(a)
def test_matrix_a_and_b(self):
"""Check that matrix type is preserved."""
a = matrix([[1.,2.], [2.,1.]])
self.do(a)
class TestEigvalsh(HermitianTestCase, TestCase):
def do(self, a):
ev = linalg.eigvalsh(a)
# flip resulting eigenvalue array, since they are returned in
# reverse order from the values given by linal.eig
ev = ev[::-1]
evalues, evectors = linalg.eig(a)
assert_almost_equal(ev, evalues)
class TestEigh(HermitianTestCase, TestCase):
def do(self, a):
ev, evc = linalg.eigh(a)
# flip resulting eigenvalue array, since they are returned in
# reverse order from the values given by linal.eig
ev = ev[::-1]
evalues, evectors = linalg.eig(a)
assert_almost_equal(ev, evalues)
if __name__ == "__main__":
run_module_suite()
|
