我们从Python开源项目中，提取了以下14个代码示例，用于说明如何使用numpy.infi()。
def test_special_values(self): # carg(-np.inf +- yi) returns +-pi for finite y > 0 yield check_real_value, ncu._arg, -np.inf, 1, np.pi, False yield check_real_value, ncu._arg, -np.inf, -1, -np.pi, False # carg(np.inf +- yi) returns +-0 for finite y > 0 yield check_real_value, ncu._arg, np.inf, 1, np.PZERO, False yield check_real_value, ncu._arg, np.inf, -1, np.NZERO, False # carg(x +- np.infi) returns +-pi/2 for finite x yield check_real_value, ncu._arg, 1, np.inf, 0.5 * np.pi, False yield check_real_value, ncu._arg, 1, -np.inf, -0.5 * np.pi, False # carg(-np.inf +- np.infi) returns +-3pi/4 yield check_real_value, ncu._arg, -np.inf, np.inf, 0.75 * np.pi, False yield check_real_value, ncu._arg, -np.inf, -np.inf, -0.75 * np.pi, False # carg(np.inf +- np.infi) returns +-pi/4 yield check_real_value, ncu._arg, np.inf, np.inf, 0.25 * np.pi, False yield check_real_value, ncu._arg, np.inf, -np.inf, -0.25 * np.pi, False # carg(x + yi) returns np.nan if x or y is nan yield check_real_value, ncu._arg, np.nan, 0, np.nan, False yield check_real_value, ncu._arg, 0, np.nan, np.nan, False yield check_real_value, ncu._arg, np.nan, np.inf, np.nan, False yield check_real_value, ncu._arg, np.inf, np.nan, np.nan, False
def test_special_values(self): # C99: Sec G 6.4.2 check = check_complex_value f = np.sqrt # csqrt(+-0 + 0i) is 0 + 0i yield check, f, np.PZERO, 0, 0, 0 yield check, f, np.NZERO, 0, 0, 0 # csqrt(x + infi) is inf + infi for any x (including NaN) yield check, f, 1, np.inf, np.inf, np.inf yield check, f, -1, np.inf, np.inf, np.inf yield check, f, np.PZERO, np.inf, np.inf, np.inf yield check, f, np.NZERO, np.inf, np.inf, np.inf yield check, f, np.inf, np.inf, np.inf, np.inf yield check, f, -np.inf, np.inf, np.inf, np.inf yield check, f, -np.nan, np.inf, np.inf, np.inf # csqrt(x + nani) is nan + nani for any finite x yield check, f, 1, np.nan, np.nan, np.nan yield check, f, -1, np.nan, np.nan, np.nan yield check, f, 0, np.nan, np.nan, np.nan # csqrt(-inf + yi) is +0 + infi for any finite y > 0 yield check, f, -np.inf, 1, np.PZERO, np.inf # csqrt(inf + yi) is +inf + 0i for any finite y > 0 yield check, f, np.inf, 1, np.inf, np.PZERO # csqrt(-inf + nani) is nan +- infi (both +i infi are valid) def _check_ninf_nan(dummy): msgform = "csqrt(-inf, nan) is (%f, %f), expected (nan, +-inf)" z = np.sqrt(np.array(np.complex(-np.inf, np.nan))) #Fixme: ugly workaround for isinf bug. with np.errstate(invalid='ignore'): if not (np.isnan(z.real) and np.isinf(z.imag)): raise AssertionError(msgform % (z.real, z.imag)) yield _check_ninf_nan, None # csqrt(+inf + nani) is inf + nani yield check, f, np.inf, np.nan, np.inf, np.nan # csqrt(nan + yi) is nan + nani for any finite y (infinite handled in x # + nani) yield check, f, np.nan, 0, np.nan, np.nan yield check, f, np.nan, 1, np.nan, np.nan yield check, f, np.nan, np.nan, np.nan, np.nan # XXX: check for conj(csqrt(z)) == csqrt(conj(z)) (need to fix branch # cuts first)
