我在共享内存中有一个结构化的 numpy 数组,它只是高维数组的一个“层”。
我有一个元组列表,我想将其值复制到这个(子)数组中。
我发现了如何从元组列表中创建一个新的 numpy 结构化数组。但我不知道如何将此元组列表转换为 EXISTING numpy(子)数组。当然,尺寸已经匹配。
当然,我可以在 Python for 循环中逐元素复制,但这似乎非常低效。我希望在作为 numpy 基础的 C++ 中完成循环。
说明:我的数组在共享内存中的原因是我将它用作 C++ 进程的通用数据结构,由互斥信号量保护。
我的元组列表如下所示:
[(25141156064, 5.3647, 221.32287846), (25141157138, 5.3647, 73.70348602), (25141155120, 5.3646, 27.77147382), (25141160388, 5.3643, 55.5000024), (25141160943, 5.3636, 166.49511561), (25141154452, 5.3578, 92), (25141154824, 5.3539, 37.22246003), (25141155187, 5.3504, 37.22246003), (25141157611, 5.34, 915), (25141157598, 5.3329, 1047.32982582), (25140831246, 5.3053, 915), (25141165780, 5.2915, 2000), (25141165781, 5.2512, 2000), (25140818946, 5.2483, 915), (25138992274, 5.1688, 458), (25121724934, 5.1542, 458), (25121034787, 4.8993, 3.47518861), (24402133353, 2.35, 341), (24859679064, 0.8, 1931.25), (24046377720, 0.5, 100), (25141166091, 5.3783, -650.51242432), (25141165779, 5.3784, -1794.28608778), (25141157632, 5.3814, -2000), (25141157601, 5.3836, -2000), (25141164181, 5.3846, -499.65636506), (25141164476, 5.4025, -91), (25141157766, 5.4026, -634.80061236), (25141153364, 5.4034, -2000), (25141107806, 5.4035, -1601.88882309), (25141157694, 5.4136, -1047.32982582), (25141148874, 5.4278, -266), (25141078136, 5.4279, -48.4864096), (25141165317, 5.4283, -2000), (25141097109, 5.4284, -914), (25141110492, 5.4344, -774.75614589), (25141110970, 5.4502, -928.32048159), (25141166045, 5.4527, -2000), (25141166041, 5.493, -2000), (25139832350, 5.5, -10.2273)]
我的 numpy 数组的元素定义如下:
Id = np.uint64
Price = np.float64
Amount = np.float64
Quotation = np.dtype ([
('id', Id),
('price', Price),
('amount', Amount),
])
self._contents = np.ndarray (
shape = (
maxNrOfMarkets,
maxNrOfItemKindsPerMarket,
maxNrOfQuotationsPerItemKind
)
dtype = Quotation,
buffer = self.sharedMemory.buf,
offset = offset
)