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Python SparseMatrix.hstack方法代码示例

本文整理汇总了Python中sympy.matrices.SparseMatrix.hstack方法的典型用法代码示例。如果您正苦于以下问题:Python SparseMatrix.hstack方法的具体用法?Python SparseMatrix.hstack怎么用?Python SparseMatrix.hstack使用的例子?那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在sympy.matrices.SparseMatrix的用法示例。


在下文中一共展示了SparseMatrix.hstack方法的1个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的Python代码示例。

示例1: test_sparse_matrix

# 需要导入模块: from sympy.matrices import SparseMatrix [as 别名]
# 或者: from sympy.matrices.SparseMatrix import hstack [as 别名]
def test_sparse_matrix():
    def sparse_eye(n):
        return SparseMatrix.eye(n)

    def sparse_zeros(n):
        return SparseMatrix.zeros(n)

    # creation args
    raises(TypeError, lambda: SparseMatrix(1, 2))

    a = SparseMatrix((
        (1, 0),
        (0, 1)
    ))
    assert SparseMatrix(a) == a

    from sympy.matrices import MutableSparseMatrix, MutableDenseMatrix
    a = MutableSparseMatrix([])
    b = MutableDenseMatrix([1, 2])
    assert a.row_join(b) == b
    assert a.col_join(b) == b
    assert type(a.row_join(b)) == type(a)
    assert type(a.col_join(b)) == type(a)

    # make sure 0 x n matrices get stacked correctly
    sparse_matrices = [SparseMatrix.zeros(0, n) for n in range(4)]
    assert SparseMatrix.hstack(*sparse_matrices) == Matrix(0, 6, [])
    sparse_matrices = [SparseMatrix.zeros(n, 0) for n in range(4)]
    assert SparseMatrix.vstack(*sparse_matrices) == Matrix(6, 0, [])

    # test element assignment
    a = SparseMatrix((
        (1, 0),
        (0, 1)
    ))

    a[3] = 4
    assert a[1, 1] == 4
    a[3] = 1

    a[0, 0] = 2
    assert a == SparseMatrix((
        (2, 0),
        (0, 1)
    ))
    a[1, 0] = 5
    assert a == SparseMatrix((
        (2, 0),
        (5, 1)
    ))
    a[1, 1] = 0
    assert a == SparseMatrix((
        (2, 0),
        (5, 0)
    ))
    assert a._smat == {(0, 0): 2, (1, 0): 5}

    # test_multiplication
    a = SparseMatrix((
        (1, 2),
        (3, 1),
        (0, 6),
    ))

    b = SparseMatrix((
        (1, 2),
        (3, 0),
    ))

    c = a*b
    assert c[0, 0] == 7
    assert c[0, 1] == 2
    assert c[1, 0] == 6
    assert c[1, 1] == 6
    assert c[2, 0] == 18
    assert c[2, 1] == 0

    try:
        eval('c = a @ b')
    except SyntaxError:
        pass
    else:
        assert c[0, 0] == 7
        assert c[0, 1] == 2
        assert c[1, 0] == 6
        assert c[1, 1] == 6
        assert c[2, 0] == 18
        assert c[2, 1] == 0

    x = Symbol("x")

    c = b * Symbol("x")
    assert isinstance(c, SparseMatrix)
    assert c[0, 0] == x
    assert c[0, 1] == 2*x
    assert c[1, 0] == 3*x
    assert c[1, 1] == 0

    c = 5 * b
    assert isinstance(c, SparseMatrix)
#.........这里部分代码省略.........
开发者ID:KonstantinTogoi,项目名称:sympy,代码行数:103,代码来源:test_sparse.py


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