大约有 31,840 项符合查询结果（耗时：0.0206秒） [XML]
How to calculate moving average using NumPy?
..., which may be is faster than FFT based methods:
EDIT Corrected an off-by-one wrong indexing spotted by Bean in the code. EDIT
def moving_average(a, n=3) :
ret = np.cumsum(a, dtype=float)
ret[n:] = ret[n:] - ret[:-n]
return ret[n - 1:] / n
>>> a = np.arange(20)
>>> m...
Why should casting be avoided? [closed]
...ts as well, and that gives (more or less) a fourth answer.
Since it's the one you didn't mention explicitly, I'll start with C. C casts have a number of problems. One is that they can do any of a number of different things. In some cases, the cast does nothing more than tell the compiler (in essenc...
Using generic std::function objects with member functions in one class
For one class I want to store some function pointers to member functions of the same class in one map storing std::function objects. But I fail right at the beginning with this code:
...
Regex to match string containing two names in any order
...
Does anyone know why this would break (in JavaScript at least) when I try to search for strings starting with '#'? ^(?=.*\b#friday\b)(?=.*\b#tgif\b).*$ fails to match blah #tgif blah #friday blah but ^(?=.*\bfriday\b)(?=.*\btgif\b).*...
A monad is just a monoid in the category of endofunctors, what's the problem?
...ote is from Saunders Mac Lane in Categories for the Working Mathematician, one of the foundational texts of Category Theory. Here it is in context, which is probably the best place to learn exactly what it means.
But, I'll take a stab. The original sentence is this:
All told, a monad in X is just a...
What are the differences between numpy arrays and matrices? Which one should I use?
...nd b are numpy arrays, then a*b is the array
formed by multiplying the components element-wise:
c = np.array([[4, 3], [2, 1]])
d = np.array([[1, 2], [3, 4]])
print(c*d)
# [[4 6]
# [6 4]]
To obtain the result of matrix multiplication, you use np.dot (or @ in Python >= 3.5, as shown above):
pr...
Difference between clustered and nonclustered index [duplicate]
...eed to keep two issues apart:
1) the primary key is a logical construct - one of the candidate keys that uniquely and reliably identifies every row in your table. This can be anything, really - an INT, a GUID, a string - pick what makes most sense for your scenario.
2) the clustering key (the colu...
Combined area of overlapping circles
...plementation details to handle all the special cases ( circle inside other one, no intersection, holes , one point contact ... )
– fa.
Nov 3 '09 at 16:03
1
...
Merge two (or more) lists into one, in C# .NET
Is it possible to convert two or more lists into one single list, in .NET using C#?
13 Answers
...
What are advantages of Artificial Neural Networks over Support Vector Machines? [closed]
...ultilayer perceptrons, because those are in direct competition with SVMs.
One specific benefit that these models have over SVMs is that their size is fixed: they are parametric models, while SVMs are non-parametric. That is, in an ANN you have a bunch of hidden layers with sizes h1 through hn depen...