%PDF- %PDF-
Mini Shell

Mini Shell

Direktori : /usr/lib/python3/dist-packages/sympy/matrices/tests/
Upload File :
Create Path :
Current File : //usr/lib/python3/dist-packages/sympy/matrices/tests/test_normalforms.py

from sympy.testing.pytest import warns_deprecated_sympy

from sympy import Symbol, Poly
from sympy.matrices import Matrix
from sympy.matrices.normalforms import invariant_factors, smith_normal_form
from sympy.polys.domains import ZZ, QQ


def test_smith_normal():
    m = Matrix([[12,6,4,8],[3,9,6,12],[2,16,14,28],[20,10,10,20]])
    smf = Matrix([[1, 0, 0, 0], [0, 10, 0, 0], [0, 0, -30, 0], [0, 0, 0, 0]])
    assert smith_normal_form(m) == smf

    x = Symbol('x')
    with warns_deprecated_sympy():
        m = Matrix([[Poly(x-1), Poly(1, x),Poly(-1,x)],
                    [0, Poly(x), Poly(-1,x)],
                    [Poly(0,x),Poly(-1,x),Poly(x)]])
    invs = 1, x - 1, x**2 - 1
    assert invariant_factors(m, domain=QQ[x]) == invs

    m = Matrix([[2, 4]])
    smf = Matrix([[2, 0]])
    assert smith_normal_form(m) == smf


def test_smith_normal_deprecated():
    from sympy.polys.solvers import RawMatrix as Matrix

    with warns_deprecated_sympy():
        m = Matrix([[12, 6, 4,8],[3,9,6,12],[2,16,14,28],[20,10,10,20]])
    setattr(m, 'ring', ZZ)
    with warns_deprecated_sympy():
        smf = Matrix([[1, 0, 0, 0], [0, 10, 0, 0], [0, 0, -30, 0], [0, 0, 0, 0]])
    assert smith_normal_form(m) == smf

    x = Symbol('x')
    with warns_deprecated_sympy():
        m = Matrix([[Poly(x-1), Poly(1, x),Poly(-1,x)],
                    [0, Poly(x), Poly(-1,x)],
                    [Poly(0,x),Poly(-1,x),Poly(x)]])
    setattr(m, 'ring', QQ[x])
    invs = (Poly(1, x, domain='QQ'), Poly(x - 1, domain='QQ'), Poly(x**2 - 1, domain='QQ'))
    assert invariant_factors(m) == invs

    with warns_deprecated_sympy():
        m = Matrix([[2, 4]])
    setattr(m, 'ring', ZZ)
    with warns_deprecated_sympy():
        smf = Matrix([[2, 0]])
    assert smith_normal_form(m) == smf

Zerion Mini Shell 1.0