Python functions.sin函数代码示例

def test_derivatives_in_spherical_coordinates():
    with GA_Printer():
        X = (r, th, phi) = symbols("r theta phi")
        curv = [[r * cos(phi) * sin(th), r * sin(phi) * sin(th), r * cos(th)], [1, r, r * sin(th)]]
        (er, eth, ephi, grad) = MV.setup("e_r e_theta e_phi", metric="[1,1,1]", coords=X, curv=curv)

        f = MV("f", "scalar", fct=True)
        A = MV("A", "vector", fct=True)
        B = MV("B", "grade2", fct=True)

        assert str(f) == "f"
        assert str(A) == "A__r*e_r + A__theta*e_theta + A__phi*e_phi"
        assert str(B) == "B__rtheta*e_r^e_theta + B__rphi*e_r^e_phi + B__thetaphi*e_theta^e_phi"

        assert str(grad * f) == "D{r}f*e_r + D{theta}f/r*e_theta + D{phi}f/(r*sin(theta))*e_phi"
        assert (
            str(grad | A)
            == "D{r}A__r + 2*A__r/r + A__theta*cos(theta)/(r*sin(theta)) + D{theta}A__theta/r + D{phi}A__phi/(r*sin(theta))"
        )
        assert (
            str(-MV.I * (grad ^ A))
            == "((A__phi*cos(theta)/sin(theta) + D{theta}A__phi - D{phi}A__theta/sin(theta))/r)*e_r + (-D{r}A__phi - A__phi/r + D{phi}A__r/(r*sin(theta)))*e_theta + (D{r}A__theta + A__theta/r - D{theta}A__r/r)*e_phi"
        )
        assert (
            str(grad ^ B)
            == "(D{r}B__thetaphi - B__rphi*cos(theta)/(r*sin(theta)) + 2*B__thetaphi/r - D{theta}B__rphi/r + D{phi}B__rtheta/(r*sin(theta)))*e_r^e_theta^e_phi"
        )

    return

def test_algebraic():
    x, y = symbols("x,y")

    assert ask(x, "algebraic") == None

    assert ask(I, "algebraic") == True
    assert ask(2 * I, "algebraic") == True
    assert ask(I / 3, "algebraic") == True

    assert ask(sqrt(7), "algebraic") == True
    assert ask(2 * sqrt(7), "algebraic") == True
    assert ask(sqrt(7) / 3, "algebraic") == True

    assert ask(I * sqrt(3), "algebraic") == True
    assert ask(sqrt(1 + I * sqrt(3)), "algebraic") == True

    assert ask((1 + I * sqrt(3) ** (S(17) / 31)), "algebraic") == True
    assert ask((1 + I * sqrt(3) ** (S(17) / pi)), "algebraic") == False

    assert ask(sin(7), "algebraic") == None
    assert ask(sqrt(sin(7)), "algebraic") == None
    assert ask(sqrt(y + I * sqrt(7)), "algebraic") == None

    assert ask(oo, "algebraic") == False
    assert ask(-oo, "algebraic") == False

    assert ask(2.47, "algebraic") == False

def test_algebraic():
    x, y = symbols('x,y')

    assert ask(Q.algebraic(x)) == None

    assert ask(Q.algebraic(I)) == True
    assert ask(Q.algebraic(2*I)) == True
    assert ask(Q.algebraic(I/3)) == True

    assert ask(Q.algebraic(sqrt(7))) == True
    assert ask(Q.algebraic(2*sqrt(7))) == True
    assert ask(Q.algebraic(sqrt(7)/3)) == True

    assert ask(Q.algebraic(I*sqrt(3))) == True
    assert ask(Q.algebraic(sqrt(1+I*sqrt(3)))) == True

    assert ask(Q.algebraic((1+I*sqrt(3)**(S(17)/31)))) == True
    assert ask(Q.algebraic((1+I*sqrt(3)**(S(17)/pi)))) == False

    assert ask(Q.algebraic(sin(7))) == None
    assert ask(Q.algebraic(sqrt(sin(7)))) == None
    assert ask(Q.algebraic(sqrt(y+I*sqrt(7)))) == None

    assert ask(Q.algebraic(oo)) == False
    assert ask(Q.algebraic(-oo)) == False

    assert ask(Q.algebraic(2.47)) == False

def test_Integral():
    assert mcode(Integral(sin(sin(x)), x)) == "Hold[Integrate[Sin[Sin[x]], x]]"
    assert mcode(Integral(exp(-x**2 - y**2),
                          (x, -oo, oo),
                          (y, -oo, oo))) == \
        "Hold[Integrate[Exp[-x^2 - y^2], {x, -Infinity, Infinity}, " \
        "{y, -Infinity, Infinity}]]"

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)
    p = rcode(mat, A)
    assert p == (
        "A[0] = x*y;\n"
        "A[1] = ifelse(y > 0,x + 2,y);\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]
    p = rcode(expr)
    assert p  == ("ifelse(x > 0,2*A[2],A[2]) + 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[4, 0]/q[1,0], sqrt(q[0,0]) + 4, 0]])
    assert rcode(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]/q[1];\n"
        "M[7] = sqrt(q[0]) + 4;\n"
        "M[8] = 0;")

def test_functional_diffgeom_ch2():
    x0, y0, r0, theta0 = symbols('x0, y0, r0, theta0', real=True)
    x, y = symbols('x, y', real=True)
    f = Function('f')

    assert (R2_p.point_to_coords(R2_r.point([x0, y0])) ==
           Matrix([sqrt(x0**2 + y0**2), atan2(y0, x0)]))
    assert (R2_r.point_to_coords(R2_p.point([r0, theta0])) ==
           Matrix([r0*cos(theta0), r0*sin(theta0)]))

    assert R2_p.jacobian(R2_r, [r0, theta0]) == Matrix(
        [[cos(theta0), -r0*sin(theta0)], [sin(theta0), r0*cos(theta0)]])

    field = f(R2.x, R2.y)
    p1_in_rect = R2_r.point([x0, y0])
    p1_in_polar = R2_p.point([sqrt(x0**2 + y0**2), atan2(y0, x0)])
    assert field.rcall(p1_in_rect) == f(x0, y0)
    assert field.rcall(p1_in_polar) == f(x0, y0)

    p_r = R2_r.point([x0, y0])
    p_p = R2_p.point([r0, theta0])
    assert R2.x(p_r) == x0
    assert R2.x(p_p) == r0*cos(theta0)
    assert R2.r(p_p) == r0
    assert R2.r(p_r) == sqrt(x0**2 + y0**2)
    assert R2.theta(p_r) == atan2(y0, x0)

    h = R2.x*R2.r**2 + R2.y**3
    assert h.rcall(p_r) == x0*(x0**2 + y0**2) + y0**3
    assert h.rcall(p_p) == r0**3*sin(theta0)**3 + r0**3*cos(theta0)

def test_algebraic():
    x, y = symbols('x,y')

    assert ask(x, 'algebraic') == None

    assert ask(I, 'algebraic') == True
    assert ask(2*I, 'algebraic') == True
    assert ask(I/3, 'algebraic') == True

    assert ask(sqrt(7), 'algebraic') == True
    assert ask(2*sqrt(7), 'algebraic') == True
    assert ask(sqrt(7)/3, 'algebraic') == True

    assert ask(I*sqrt(3), 'algebraic') == True
    assert ask(sqrt(1+I*sqrt(3)), 'algebraic') == True

    assert ask((1+I*sqrt(3)**(S(17)/31)), 'algebraic') == True
    assert ask((1+I*sqrt(3)**(S(17)/pi)), 'algebraic') == False

    assert ask(sin(7), 'algebraic') == None
    assert ask(sqrt(sin(7)), 'algebraic') == None
    assert ask(sqrt(y+I*sqrt(7)), 'algebraic') == None

    assert ask(oo, 'algebraic') == False
    assert ask(-oo, 'algebraic') == False

    assert ask(2.47, 'algebraic') == False

 def _get_lambda_evaluator(self):
     fr = self.d_vars[0]
     t  = self.u_interval.v
     p  = self.v_interval.v
     fx = fr*cos(t)*sin(p)
     fy = fr*sin(t)*sin(p)
     fz = fr*cos(p)
     return lambdify([t,p], [fx,fy,fz])

def rs_sin(p, x, prec):
    """
    Sine of a series

    Returns the series expansion of the sin of p, about 0.

    Examples
    ========

    >>> from sympy.polys.domains import QQ
    >>> from sympy.polys.rings import ring
    >>> from sympy.polys.ring_series import rs_sin
    >>> R, x, y = ring('x, y', QQ)
    >>> rs_sin(x + x*y, x, 4)
    -1/6*x**3*y**3 - 1/2*x**3*y**2 - 1/2*x**3*y - 1/6*x**3 + x*y + x

    See Also
    ========

    sin
    """
    R = x.ring
    if not p:
        return R(0)
    if _has_constant_term(p, x):
        zm = R.zero_monom
        c = p[zm]
        c_expr = c.as_expr()
        if R.domain is EX:
            t1, t2 = sin(c_expr), cos(c_expr)
        elif isinstance(c, PolyElement):
            try:
                t1, t2 = R(sin(c_expr)), R(cos(c_expr))
            except ValueError:
                raise DomainError("The given series can't be expanded in this " "domain.")
        else:
            raise DomainError("The given series can't be expanded in this " "domain")
            raise NotImplementedError
        p1 = p - c

        # Makes use of sympy cos, sin fuctions to evaluate the values of the cos/sin
        # of the constant term.
        return rs_sin(p1, x, prec) * t2 + rs_cos(p1, x, prec) * t1

    # Series is calculated in terms of tan as its evaluation is fast.
    if len(p) > 20 and p.ngens == 1:
        t = rs_tan(p / 2, x, prec)
        t2 = rs_square(t, x, prec)
        p1 = rs_series_inversion(1 + t2, x, prec)
        return rs_mul(p1, 2 * t, x, prec)
    one = R(1)
    n = 1
    c = [0]
    for k in range(2, prec + 2, 2):
        c.append(one / n)
        c.append(0)
        n *= -k * (k + 1)
    return rs_series_from_list(p, c, x, prec)

def test_C99CodePrinter__precision():
    n = symbols('n', integer=True)
    f32_printer = C99CodePrinter(dict(type_aliases={real: float32}))
    f64_printer = C99CodePrinter(dict(type_aliases={real: float64}))
    f80_printer = C99CodePrinter(dict(type_aliases={real: float80}))
    assert f32_printer.doprint(sin(x+2.1)) == 'sinf(x + 2.1F)'
    assert f64_printer.doprint(sin(x+2.1)) == 'sin(x + 2.1000000000000001)'
    assert f80_printer.doprint(sin(x+Float('2.0'))) == 'sinl(x + 2.0L)'

    for printer, suffix in zip([f32_printer, f64_printer, f80_printer], ['f', '', 'l']):
        def check(expr, ref):
            assert printer.doprint(expr) == ref.format(s=suffix, S=suffix.upper())
        check(Abs(n), 'abs(n)')
        check(Abs(x + 2.0), 'fabs{s}(x + 2.0{S})')
        check(sin(x + 4.0)**cos(x - 2.0), 'pow{s}(sin{s}(x + 4.0{S}), cos{s}(x - 2.0{S}))')
        check(exp(x*8.0), 'exp{s}(8.0{S}*x)')
        check(exp2(x), 'exp2{s}(x)')
        check(expm1(x*4.0), 'expm1{s}(4.0{S}*x)')
        check(Mod(n, 2), '((n) % (2))')
        check(Mod(2*n + 3, 3*n + 5), '((2*n + 3) % (3*n + 5))')
        check(Mod(x + 2.0, 3.0), 'fmod{s}(1.0{S}*x + 2.0{S}, 3.0{S})')
        check(Mod(x, 2.0*x + 3.0), 'fmod{s}(1.0{S}*x, 2.0{S}*x + 3.0{S})')
        check(log(x/2), 'log{s}((1.0{S}/2.0{S})*x)')
        check(log10(3*x/2), 'log10{s}((3.0{S}/2.0{S})*x)')
        check(log2(x*8.0), 'log2{s}(8.0{S}*x)')
        check(log1p(x), 'log1p{s}(x)')
        check(2**x, 'pow{s}(2, x)')
        check(2.0**x, 'pow{s}(2.0{S}, x)')
        check(x**3, 'pow{s}(x, 3)')
        check(x**4.0, 'pow{s}(x, 4.0{S})')
        check(sqrt(3+x), 'sqrt{s}(x + 3)')
        check(Cbrt(x-2.0), 'cbrt{s}(x - 2.0{S})')
        check(hypot(x, y), 'hypot{s}(x, y)')
        check(sin(3.*x + 2.), 'sin{s}(3.0{S}*x + 2.0{S})')
        check(cos(3.*x - 1.), 'cos{s}(3.0{S}*x - 1.0{S})')
        check(tan(4.*y + 2.), 'tan{s}(4.0{S}*y + 2.0{S})')
        check(asin(3.*x + 2.), 'asin{s}(3.0{S}*x + 2.0{S})')
        check(acos(3.*x + 2.), 'acos{s}(3.0{S}*x + 2.0{S})')
        check(atan(3.*x + 2.), 'atan{s}(3.0{S}*x + 2.0{S})')
        check(atan2(3.*x, 2.*y), 'atan2{s}(3.0{S}*x, 2.0{S}*y)')

        check(sinh(3.*x + 2.), 'sinh{s}(3.0{S}*x + 2.0{S})')
        check(cosh(3.*x - 1.), 'cosh{s}(3.0{S}*x - 1.0{S})')
        check(tanh(4.0*y + 2.), 'tanh{s}(4.0{S}*y + 2.0{S})')
        check(asinh(3.*x + 2.), 'asinh{s}(3.0{S}*x + 2.0{S})')
        check(acosh(3.*x + 2.), 'acosh{s}(3.0{S}*x + 2.0{S})')
        check(atanh(3.*x + 2.), 'atanh{s}(3.0{S}*x + 2.0{S})')
        check(erf(42.*x), 'erf{s}(42.0{S}*x)')
        check(erfc(42.*x), 'erfc{s}(42.0{S}*x)')
        check(gamma(x), 'tgamma{s}(x)')
        check(loggamma(x), 'lgamma{s}(x)')

        check(ceiling(x + 2.), "ceil{s}(x + 2.0{S})")
        check(floor(x + 2.), "floor{s}(x + 2.0{S})")
        check(fma(x, y, -z), 'fma{s}(x, y, -z)')
        check(Max(x, 8.0, x**4.0), 'fmax{s}(8.0{S}, fmax{s}(x, pow{s}(x, 4.0{S})))')
        check(Min(x, 2.0), 'fmin{s}(2.0{S}, x)')

def test_trigintegrate_mixed():
    assert trigintegrate(sin(x)*sec(x), x) == -log(sin(x)**2 - 1)/2
    assert trigintegrate(sin(x)*csc(x), x) == x
    assert trigintegrate(sin(x)*cot(x), x) == sin(x)

    assert trigintegrate(cos(x)*sec(x), x) == x
    assert trigintegrate(cos(x)*csc(x), x) == log(cos(x)**2 - 1)/2
    assert trigintegrate(cos(x)*tan(x), x) == -cos(x)
    assert trigintegrate(cos(x)*cot(x), x) == log(cos(x) - 1)/2 \
        - log(cos(x) + 1)/2 + cos(x)

def test_functional_exponent():
    t = standard_transformations + (convert_xor, function_exponentiation)
    x = Symbol('x')
    y = Symbol('y')
    a = Symbol('a')
    yfcn = Function('y')
    assert parse_expr("sin^2(x)", transformations=t) == (sin(x))**2
    assert parse_expr("sin^y(x)", transformations=t) == (sin(x))**y
    assert parse_expr("exp^y(x)", transformations=t) == (exp(x))**y
    assert parse_expr("E^y(x)", transformations=t) == exp(yfcn(x))
    assert parse_expr("a^y(x)", transformations=t) == a**(yfcn(x))

def test_bounded():
    x, y = symbols('xy')
    assert ask(x, Q.bounded) == False
    assert ask(x, Q.bounded, Assume(x, Q.bounded)) == True
    assert ask(x, Q.bounded, Assume(y, Q.bounded)) == False
    assert ask(x, Q.bounded, Assume(x, Q.complex)) == False

    assert ask(x+1, Q.bounded) == False
    assert ask(x+1, Q.bounded, Assume(x, Q.bounded)) == True
    assert ask(x+y, Q.bounded) == None
    assert ask(x+y, Q.bounded, Assume(x, Q.bounded)) == False
    assert ask(x+1, Q.bounded, Assume(x, Q.bounded) & \
                Assume(y, Q.bounded)) == True

    assert ask(2*x, Q.bounded) == False
    assert ask(2*x, Q.bounded, Assume(x, Q.bounded)) == True
    assert ask(x*y, Q.bounded) == None
    assert ask(x*y, Q.bounded, Assume(x, Q.bounded)) == False
    assert ask(x*y, Q.bounded, Assume(x, Q.bounded) & \
                Assume(y, Q.bounded)) == True

    assert ask(x**2, Q.bounded) == False
    assert ask(2**x, Q.bounded) == False
    assert ask(2**x, Q.bounded, Assume(x, Q.bounded)) == True
    assert ask(x**x, Q.bounded) == False
    assert ask(Rational(1,2) ** x, Q.bounded) == True
    assert ask(x ** Rational(1,2), Q.bounded) == False

    # sign function
    assert ask(sign(x), Q.bounded) == True
    assert ask(sign(x), Q.bounded, Assume(x, Q.bounded, False)) == True

    # exponential functions
    assert ask(log(x), Q.bounded) == False
    assert ask(log(x), Q.bounded, Assume(x, Q.bounded)) == True
    assert ask(exp(x), Q.bounded) == False
    assert ask(exp(x), Q.bounded, Assume(x, Q.bounded)) == True
    assert ask(exp(2), Q.bounded) == True

    # trigonometric functions
    assert ask(sin(x), Q.bounded) == True
    assert ask(sin(x), Q.bounded, Assume(x, Q.bounded, False)) == True
    assert ask(cos(x), Q.bounded) == True
    assert ask(cos(x), Q.bounded, Assume(x, Q.bounded, False)) == True
    assert ask(2*sin(x), Q.bounded) == True
    assert ask(sin(x)**2, Q.bounded) == True
    assert ask(cos(x)**2, Q.bounded) == True
    assert ask(cos(x) + sin(x), Q.bounded) == True

def test_bounded():
    x, y = symbols('x,y')
    assert ask(Q.bounded(x)) == False
    assert ask(Q.bounded(x), Q.bounded(x)) == True
    assert ask(Q.bounded(x), Q.bounded(y)) == False
    assert ask(Q.bounded(x), Q.complex(x)) == False

    assert ask(Q.bounded(x+1)) == False
    assert ask(Q.bounded(x+1), Q.bounded(x)) == True
    assert ask(Q.bounded(x+y)) == None
    assert ask(Q.bounded(x+y), Q.bounded(x)) == False
    assert ask(Q.bounded(x+1), Q.bounded(x) & Q.bounded(y)) == True

    assert ask(Q.bounded(2*x)) == False
    assert ask(Q.bounded(2*x), Q.bounded(x)) == True
    assert ask(Q.bounded(x*y)) == None
    assert ask(Q.bounded(x*y), Q.bounded(x)) == False
    assert ask(Q.bounded(x*y), Q.bounded(x) & Q.bounded(y)) == True

    assert ask(Q.bounded(x**2)) == False
    assert ask(Q.bounded(2**x)) == False
    assert ask(Q.bounded(2**x), Q.bounded(x)) == True
    assert ask(Q.bounded(x**x)) == False
    assert ask(Q.bounded(Rational(1,2) ** x)) == None
    assert ask(Q.bounded(Rational(1,2) ** x), Q.positive(x)) == True
    assert ask(Q.bounded(Rational(1,2) ** x), Q.negative(x)) == False
    assert ask(Q.bounded(sqrt(x))) == False

    # sign function
    assert ask(Q.bounded(sign(x))) == True
    assert ask(Q.bounded(sign(x)), ~Q.bounded(x)) == True

    # exponential functions
    assert ask(Q.bounded(log(x))) == False
    assert ask(Q.bounded(log(x)), Q.bounded(x)) == True
    assert ask(Q.bounded(exp(x))) == False
    assert ask(Q.bounded(exp(x)), Q.bounded(x)) == True
    assert ask(Q.bounded(exp(2))) == True

    # trigonometric functions
    assert ask(Q.bounded(sin(x))) == True
    assert ask(Q.bounded(sin(x)), ~Q.bounded(x)) == True
    assert ask(Q.bounded(cos(x))) == True
    assert ask(Q.bounded(cos(x)), ~Q.bounded(x)) == True
    assert ask(Q.bounded(2*sin(x))) == True
    assert ask(Q.bounded(sin(x)**2)) == True
    assert ask(Q.bounded(cos(x)**2)) == True
    assert ask(Q.bounded(cos(x) + sin(x))) == True

def test_octave_piecewise():
    expr = Piecewise((x, x < 1), (x**2, True))
    assert mcode(expr) == "((x < 1).*(x) + (~(x < 1)).*(x.^2))"
    assert mcode(expr, assign_to="r") == (
        "r = ((x < 1).*(x) + (~(x < 1)).*(x.^2));")
    assert mcode(expr, assign_to="r", inline=False) == (
        "if (x < 1)\n"
        "  r = x;\n"
        "else\n"
        "  r = x.^2;\n"
        "end")
    expr = Piecewise((x**2, x < 1), (x**3, x < 2), (x**4, x < 3), (x**5, True))
    expected = ("((x < 1).*(x.^2) + (~(x < 1)).*( ...\n"
                "(x < 2).*(x.^3) + (~(x < 2)).*( ...\n"
                "(x < 3).*(x.^4) + (~(x < 3)).*(x.^5))))")
    assert mcode(expr) == expected
    assert mcode(expr, assign_to="r") == "r = " + expected + ";"
    assert mcode(expr, assign_to="r", inline=False) == (
        "if (x < 1)\n"
        "  r = x.^2;\n"
        "elseif (x < 2)\n"
        "  r = x.^3;\n"
        "elseif (x < 3)\n"
        "  r = x.^4;\n"
        "else\n"
        "  r = x.^5;\n"
        "end")
    # Check that Piecewise without a True (default) condition error
    expr = Piecewise((x, x < 1), (x**2, x > 1), (sin(x), x > 0))
    raises(ValueError, lambda: mcode(expr))