def test_Matrix_printing():
    # Test returning a Matrix
    mat = Matrix([x*y, Piecewise((2 + x, y>0), (y, True)), sin(z)])
    A = MatrixSymbol('A', 3, 1)
    assert ccode(mat, A) == (
        "A[0] = x*y;\n"
        "if (y > 0) {\n"
        "   A[1] = x + 2;\n"
        "}\n"
        "else {\n"
        "   A[1] = y;\n"
        "}\n"
        "A[2] = sin(z);")
    # Test using MatrixElements in expressions
    expr = Piecewise((2*A[2, 0], x > 0), (A[2, 0], True)) + sin(A[1, 0]) + A[0, 0]
    assert ccode(expr) == (
        "((x > 0) ? (\n"
        "   2*A[2]\n"
        ")\n"
        ": (\n"
        "   A[2]\n"
        ")) + sin(A[1]) + A[0]")
    # Test using MatrixElements in a Matrix
    q = MatrixSymbol('q', 5, 1)
    M = MatrixSymbol('M', 3, 3)
    m = Matrix([[sin(q[1,0]), 0, cos(q[2,0])],
        [q[1,0] + q[2,0], q[3, 0], 5],
        [2*q[1,0]/q[4, 0], sqrt(q[0,0]) + 4, 0]])
    assert ccode(m, M) == (
        "M[0] = sin(q[1]);\n"
        "M[1] = 0;\n"
        "M[2] = cos(q[2]);\n"
        "M[3] = q[1] + q[2];\n"
        "M[4] = q[3];\n"
        "M[5] = 5;\n"
        "M[6] = 2*q[4]*1.0/q[1];\n"
        "M[7] = 4 + sqrt(q[0]);\n"
        "M[8] = 0;")
dataset/ETHPy150Open sympy/sympy/sympy/printing/tests/test_ccode.py/test_Matrix_printing/swapped operands of `/`