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333 lines
10 KiB
333 lines
10 KiB
5 months ago
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# TODO: don't use round
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from __future__ import division
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import pytest
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from mpmath import *
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xrange = libmp.backend.xrange
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# XXX: these shouldn't be visible(?)
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LU_decomp = mp.LU_decomp
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L_solve = mp.L_solve
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U_solve = mp.U_solve
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householder = mp.householder
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improve_solution = mp.improve_solution
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A1 = matrix([[3, 1, 6],
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[2, 1, 3],
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[1, 1, 1]])
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b1 = [2, 7, 4]
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A2 = matrix([[ 2, -1, -1, 2],
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[ 6, -2, 3, -1],
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[-4, 2, 3, -2],
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[ 2, 0, 4, -3]])
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b2 = [3, -3, -2, -1]
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A3 = matrix([[ 1, 0, -1, -1, 0],
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[ 0, 1, 1, 0, -1],
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[ 4, -5, 2, 0, 0],
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[ 0, 0, -2, 9,-12],
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[ 0, 5, 0, 0, 12]])
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b3 = [0, 0, 0, 0, 50]
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A4 = matrix([[10.235, -4.56, 0., -0.035, 5.67],
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[-2.463, 1.27, 3.97, -8.63, 1.08],
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[-6.58, 0.86, -0.257, 9.32, -43.6 ],
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[ 9.83, 7.39, -17.25, 0.036, 24.86],
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[-9.31, 34.9, 78.56, 1.07, 65.8 ]])
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b4 = [8.95, 20.54, 7.42, 5.60, 58.43]
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A5 = matrix([[ 1, 2, -4],
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[-2, -3, 5],
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[ 3, 5, -8]])
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A6 = matrix([[ 1.377360, 2.481400, 5.359190],
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[ 2.679280, -1.229560, 25.560210],
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[-1.225280+1.e6, 9.910180, -35.049900-1.e6]])
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b6 = [23.500000, -15.760000, 2.340000]
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A7 = matrix([[1, -0.5],
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[2, 1],
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[-2, 6]])
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b7 = [3, 2, -4]
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A8 = matrix([[1, 2, 3],
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[-1, 0, 1],
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[-1, -2, -1],
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[1, 0, -1]])
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b8 = [1, 2, 3, 4]
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A9 = matrix([[ 4, 2, -2],
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[ 2, 5, -4],
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[-2, -4, 5.5]])
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b9 = [10, 16, -15.5]
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A10 = matrix([[1.0 + 1.0j, 2.0, 2.0],
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[4.0, 5.0, 6.0],
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[7.0, 8.0, 9.0]])
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b10 = [1.0, 1.0 + 1.0j, 1.0]
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def test_LU_decomp():
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A = A3.copy()
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b = b3
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A, p = LU_decomp(A)
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y = L_solve(A, b, p)
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x = U_solve(A, y)
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assert p == [2, 1, 2, 3]
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assert [round(i, 14) for i in x] == [3.78953107960742, 2.9989094874591098,
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-0.081788440567070006, 3.8713195201744801, 2.9171210468920399]
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A = A4.copy()
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b = b4
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A, p = LU_decomp(A)
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y = L_solve(A, b, p)
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x = U_solve(A, y)
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assert p == [0, 3, 4, 3]
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assert [round(i, 14) for i in x] == [2.6383625899619201, 2.6643834462368399,
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0.79208015947958998, -2.5088376454101899, -1.0567657691375001]
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A = randmatrix(3)
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bak = A.copy()
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LU_decomp(A, overwrite=1)
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assert A != bak
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def test_inverse():
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for A in [A1, A2, A5]:
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inv = inverse(A)
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assert mnorm(A*inv - eye(A.rows), 1) < 1.e-14
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def test_householder():
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mp.dps = 15
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A, b = A8, b8
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H, p, x, r = householder(extend(A, b))
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assert H == matrix(
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[[mpf('3.0'), mpf('-2.0'), mpf('-1.0'), 0],
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[-1.0,mpf('3.333333333333333'),mpf('-2.9999999999999991'),mpf('2.0')],
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[-1.0, mpf('-0.66666666666666674'),mpf('2.8142135623730948'),
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mpf('-2.8284271247461898')],
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[1.0, mpf('-1.3333333333333333'),mpf('-0.20000000000000018'),
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mpf('4.2426406871192857')]])
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assert p == [-2, -2, mpf('-1.4142135623730949')]
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assert round(norm(r, 2), 10) == 4.2426406870999998
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y = [102.102, 58.344, 36.463, 24.310, 17.017, 12.376, 9.282, 7.140, 5.610,
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4.488, 3.6465, 3.003]
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def coeff(n):
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# similiar to Hilbert matrix
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A = []
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for i in range(1, 13):
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A.append([1. / (i + j - 1) for j in range(1, n + 1)])
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return matrix(A)
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residuals = []
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refres = []
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for n in range(2, 7):
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A = coeff(n)
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H, p, x, r = householder(extend(A, y))
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x = matrix(x)
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y = matrix(y)
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residuals.append(norm(r, 2))
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refres.append(norm(residual(A, x, y), 2))
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assert [round(res, 10) for res in residuals] == [15.1733888877,
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0.82378073210000002, 0.302645887, 0.0260109244,
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0.00058653999999999998]
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assert norm(matrix(residuals) - matrix(refres), inf) < 1.e-13
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def hilbert_cmplx(n):
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# Complexified Hilbert matrix
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A = hilbert(2*n,n)
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v = randmatrix(2*n, 2, min=-1, max=1)
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v = v.apply(lambda x: exp(1J*pi()*x))
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A = diag(v[:,0])*A*diag(v[:n,1])
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return A
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residuals_cmplx = []
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refres_cmplx = []
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for n in range(2, 10):
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A = hilbert_cmplx(n)
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H, p, x, r = householder(A.copy())
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residuals_cmplx.append(norm(r, 2))
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refres_cmplx.append(norm(residual(A[:,:n-1], x, A[:,n-1]), 2))
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assert norm(matrix(residuals_cmplx) - matrix(refres_cmplx), inf) < 1.e-13
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def test_factorization():
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A = randmatrix(5)
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P, L, U = lu(A)
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assert mnorm(P*A - L*U, 1) < 1.e-15
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def test_solve():
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assert norm(residual(A6, lu_solve(A6, b6), b6), inf) < 1.e-10
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assert norm(residual(A7, lu_solve(A7, b7), b7), inf) < 1.5
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assert norm(residual(A8, lu_solve(A8, b8), b8), inf) <= 3 + 1.e-10
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assert norm(residual(A6, qr_solve(A6, b6)[0], b6), inf) < 1.e-10
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assert norm(residual(A7, qr_solve(A7, b7)[0], b7), inf) < 1.5
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assert norm(residual(A8, qr_solve(A8, b8)[0], b8), 2) <= 4.3
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assert norm(residual(A10, lu_solve(A10, b10), b10), 2) < 1.e-10
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assert norm(residual(A10, qr_solve(A10, b10)[0], b10), 2) < 1.e-10
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def test_solve_overdet_complex():
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A = matrix([[1, 2j], [3, 4j], [5, 6]])
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b = matrix([1 + j, 2, -j])
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assert norm(residual(A, lu_solve(A, b), b)) < 1.0208
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def test_singular():
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mp.dps = 15
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A = [[5.6, 1.2], [7./15, .1]]
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B = repr(zeros(2))
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b = [1, 2]
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for i in ['lu_solve(%s, %s)' % (A, b), 'lu_solve(%s, %s)' % (B, b),
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'qr_solve(%s, %s)' % (A, b), 'qr_solve(%s, %s)' % (B, b)]:
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pytest.raises((ZeroDivisionError, ValueError), lambda: eval(i))
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def test_cholesky():
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assert fp.cholesky(fp.matrix(A9)) == fp.matrix([[2, 0, 0], [1, 2, 0], [-1, -3/2, 3/2]])
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x = fp.cholesky_solve(A9, b9)
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assert fp.norm(fp.residual(A9, x, b9), fp.inf) == 0
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def test_det():
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assert det(A1) == 1
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assert round(det(A2), 14) == 8
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assert round(det(A3)) == 1834
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assert round(det(A4)) == 4443376
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assert det(A5) == 1
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assert round(det(A6)) == 78356463
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assert det(zeros(3)) == 0
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def test_cond():
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mp.dps = 15
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A = matrix([[1.2969, 0.8648], [0.2161, 0.1441]])
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assert cond(A, lambda x: mnorm(x,1)) == mpf('327065209.73817754')
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assert cond(A, lambda x: mnorm(x,inf)) == mpf('327065209.73817754')
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assert cond(A, lambda x: mnorm(x,'F')) == mpf('249729266.80008656')
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@extradps(50)
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def test_precision():
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A = randmatrix(10, 10)
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assert mnorm(inverse(inverse(A)) - A, 1) < 1.e-45
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def test_interval_matrix():
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mp.dps = 15
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iv.dps = 15
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a = iv.matrix([['0.1','0.3','1.0'],['7.1','5.5','4.8'],['3.2','4.4','5.6']])
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b = iv.matrix(['4','0.6','0.5'])
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c = iv.lu_solve(a, b)
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assert c[0].delta < 1e-13
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assert c[1].delta < 1e-13
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assert c[2].delta < 1e-13
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assert 5.25823271130625686059275 in c[0]
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assert -13.155049396267837541163 in c[1]
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assert 7.42069154774972557628979 in c[2]
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def test_LU_cache():
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A = randmatrix(3)
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LU = LU_decomp(A)
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assert A._LU == LU_decomp(A)
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A[0,0] = -1000
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assert A._LU is None
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def test_improve_solution():
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A = randmatrix(5, min=1e-20, max=1e20)
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b = randmatrix(5, 1, min=-1000, max=1000)
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x1 = lu_solve(A, b) + randmatrix(5, 1, min=-1e-5, max=1.e-5)
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x2 = improve_solution(A, x1, b)
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assert norm(residual(A, x2, b), 2) < norm(residual(A, x1, b), 2)
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def test_exp_pade():
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for i in range(3):
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dps = 15
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extra = 15
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mp.dps = dps + extra
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dm = 0
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N = 3
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dg = range(1,N+1)
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a = diag(dg)
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expa = diag([exp(x) for x in dg])
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# choose a random matrix not close to be singular
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# to avoid adding too much extra precision in computing
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# m**-1 * M * m
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while abs(dm) < 0.01:
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m = randmatrix(N)
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dm = det(m)
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m = m/dm
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a1 = m**-1 * a * m
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e2 = m**-1 * expa * m
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mp.dps = dps
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e1 = expm(a1, method='pade')
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mp.dps = dps + extra
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d = e2 - e1
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#print d
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mp.dps = dps
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assert norm(d, inf).ae(0)
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mp.dps = 15
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def test_qr():
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mp.dps = 15 # used default value for dps
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lowlimit = -9 # lower limit of matrix element value
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uplimit = 9 # uppter limit of matrix element value
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maxm = 4 # max matrix size
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flg = False # toggle to create real vs complex matrix
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zero = mpf('0.0')
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for k in xrange(0,10):
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exdps = 0
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mode = 'full'
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flg = bool(k % 2)
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# generate arbitrary matrix size (2 to maxm)
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num1 = nint(maxm*rand())
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num2 = nint(maxm*rand())
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m = int(max(num1, num2))
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n = int(min(num1, num2))
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# create matrix
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A = mp.matrix(m,n)
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# populate matrix values with arbitrary integers
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if flg:
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flg = False
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dtype = 'complex'
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for j in xrange(0,n):
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for i in xrange(0,m):
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val = nint(lowlimit + (uplimit-lowlimit)*rand())
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val2 = nint(lowlimit + (uplimit-lowlimit)*rand())
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A[i,j] = mpc(val, val2)
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else:
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flg = True
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dtype = 'real'
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for j in xrange(0,n):
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for i in xrange(0,m):
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val = nint(lowlimit + (uplimit-lowlimit)*rand())
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A[i,j] = mpf(val)
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# perform A -> QR decomposition
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Q, R = qr(A, mode, edps = exdps)
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#print('\n\n A = \n', nstr(A, 4))
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#print('\n Q = \n', nstr(Q, 4))
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#print('\n R = \n', nstr(R, 4))
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#print('\n Q*R = \n', nstr(Q*R, 4))
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maxnorm = mpf('1.0E-11')
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n1 = norm(A - Q * R)
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#print '\n Norm of A - Q * R = ', n1
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assert n1 <= maxnorm
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if dtype == 'real':
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n1 = norm(eye(m) - Q.T * Q)
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#print ' Norm of I - Q.T * Q = ', n1
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assert n1 <= maxnorm
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n1 = norm(eye(m) - Q * Q.T)
|
||
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#print ' Norm of I - Q * Q.T = ', n1
|
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assert n1 <= maxnorm
|
||
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|
||
|
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if dtype == 'complex':
|
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|
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n1 = norm(eye(m) - Q.T * Q.conjugate())
|
||
|
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#print ' Norm of I - Q.T * Q.conjugate() = ', n1
|
||
|
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assert n1 <= maxnorm
|
||
|
|
|
||
|
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n1 = norm(eye(m) - Q.conjugate() * Q.T)
|
||
|
|
#print ' Norm of I - Q.conjugate() * Q.T = ', n1
|
||
|
|
assert n1 <= maxnorm
|