我有兩個熊貓DataFrames,其中一個具有索引和列是另一個的子集。例如: DF1 = date a b c
20170101 1.0 2.2 3
20170102 2.1 5.2 -3.0
20170103 4.2 1.8 10.0
...
20170331 9.8 5.1 4.5
DF2 = date a c
20170101 NaN 2.1
20170103 4
我有一個數據幀: df =
A B C D
DATA_DATE
20170103 5.0 3.0 NaN NaN
20170104 NaN NaN NaN 1.0
20170105 1.0 NaN 2.0 3.0
而且我有一系列 s =
DATA_DATE
20170103 4.0
20170104 0.0
20170105 2.2
我想明智的元素max()運
我想在numpy中做兩個二維數組的元素明智的外積。 A.shape = (100, 3) # A numpy ndarray
B.shape = (100, 5) # A numpy ndarray
C = element_wise_outer_product(A, B) # A function that does the trick
C.shape = (100, 3, 5) # Th
我試圖用numpy繪製一些複雜的函數。一些工作代碼示例: import numpy as np
from PIL import Image
size = 1000
w = np.linspace(-10, 10, size)
x, y = np.meshgrid(w, w)
r = x + 1j*y
def f(q):
return np.angle(q)
z =
我想執行的張量邏輯元素智能opertaions,但似乎「和」關鍵字進行邏輯或,而「或」關鍵字進行邏輯和 : a = torch.zeros(3)
a[1] = 1 -- a will be [1,0,0]
b = torch.ones(3)
b[3] = 0 -- b will be [1,1,0]
c = torch.eq(a,1) a