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78 lines
2.0 KiB
78 lines
2.0 KiB
5 months ago
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"""
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We have a few different kind of Matrices
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Matrix, ImmutableMatrix, MatrixExpr
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Here we test the extent to which they cooperate
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"""
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from sympy.core.symbol import symbols
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from sympy.matrices import (Matrix, MatrixSymbol, eye, Identity,
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ImmutableMatrix)
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from sympy.matrices.expressions import MatrixExpr, MatAdd
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from sympy.matrices.common import classof
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from sympy.testing.pytest import raises
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SM = MatrixSymbol('X', 3, 3)
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SV = MatrixSymbol('v', 3, 1)
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MM = Matrix([[1, 2, 3], [4, 5, 6], [7, 8, 9]])
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IM = ImmutableMatrix([[1, 2, 3], [4, 5, 6], [7, 8, 9]])
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meye = eye(3)
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imeye = ImmutableMatrix(eye(3))
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ideye = Identity(3)
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a, b, c = symbols('a,b,c')
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def test_IM_MM():
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assert isinstance(MM + IM, ImmutableMatrix)
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assert isinstance(IM + MM, ImmutableMatrix)
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assert isinstance(2*IM + MM, ImmutableMatrix)
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assert MM.equals(IM)
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def test_ME_MM():
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assert isinstance(Identity(3) + MM, MatrixExpr)
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assert isinstance(SM + MM, MatAdd)
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assert isinstance(MM + SM, MatAdd)
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assert (Identity(3) + MM)[1, 1] == 6
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def test_equality():
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a, b, c = Identity(3), eye(3), ImmutableMatrix(eye(3))
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for x in [a, b, c]:
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for y in [a, b, c]:
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assert x.equals(y)
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def test_matrix_symbol_MM():
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X = MatrixSymbol('X', 3, 3)
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Y = eye(3) + X
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assert Y[1, 1] == 1 + X[1, 1]
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def test_matrix_symbol_vector_matrix_multiplication():
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A = MM * SV
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B = IM * SV
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assert A == B
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C = (SV.T * MM.T).T
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assert B == C
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D = (SV.T * IM.T).T
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assert C == D
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def test_indexing_interactions():
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assert (a * IM)[1, 1] == 5*a
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assert (SM + IM)[1, 1] == SM[1, 1] + IM[1, 1]
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assert (SM * IM)[1, 1] == SM[1, 0]*IM[0, 1] + SM[1, 1]*IM[1, 1] + \
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SM[1, 2]*IM[2, 1]
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def test_classof():
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A = Matrix(3, 3, range(9))
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B = ImmutableMatrix(3, 3, range(9))
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C = MatrixSymbol('C', 3, 3)
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assert classof(A, A) == Matrix
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assert classof(B, B) == ImmutableMatrix
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assert classof(A, B) == ImmutableMatrix
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assert classof(B, A) == ImmutableMatrix
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raises(TypeError, lambda: classof(A, C))
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