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Mini Shell
Mini Shell
from sympy.testing.pytest import raises
from sympy import (
Array, ImmutableDenseNDimArray, ImmutableSparseNDimArray,
MutableDenseNDimArray, MutableSparseNDimArray, sin, cos,
simplify, Matrix
)
from sympy.abc import x, y
array_types = [
ImmutableDenseNDimArray,
ImmutableSparseNDimArray,
MutableDenseNDimArray,
MutableSparseNDimArray
]
def test_array_negative_indices():
for ArrayType in array_types:
test_array = ArrayType([[1, 2, 3, 4, 5], [6, 7, 8, 9, 10]])
assert test_array[:, -1] == Array([5, 10])
assert test_array[:, -2] == Array([4, 9])
assert test_array[:, -3] == Array([3, 8])
assert test_array[:, -4] == Array([2, 7])
assert test_array[:, -5] == Array([1, 6])
assert test_array[:, 0] == Array([1, 6])
assert test_array[:, 1] == Array([2, 7])
assert test_array[:, 2] == Array([3, 8])
assert test_array[:, 3] == Array([4, 9])
assert test_array[:, 4] == Array([5, 10])
raises(ValueError, lambda: test_array[:, -6])
raises(ValueError, lambda: test_array[-3, :])
assert test_array[-1, -1] == 10
def test_issue_18361():
A = Array([sin(2 * x) - 2 * sin(x) * cos(x)])
B = Array([sin(x)**2 + cos(x)**2, 0])
C = Array([(x + x**2)/(x*sin(y)**2 + x*cos(y)**2), 2*sin(x)*cos(x)])
assert simplify(A) == Array([0])
assert simplify(B) == Array([1, 0])
assert simplify(C) == Array([x + 1, sin(2*x)])
def test_issue_20222():
A = Array([[1, 2], [3, 4]])
B = Matrix([[1,2],[3,4]])
raises(TypeError, lambda: A - B)
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