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How to access the ith column of a NumPy multidimensional array?
.... Using the copied version is much faster:
%timeit A_c1_ref.sum() # ~248 µs
%timeit A_c1_copy.sum() # ~12.8 µs
This is due to the different number of strides mentioned before:
A_c1_ref.strides[0] # 40000 bytes
A_c1_copy.strides[0] # 4 bytes
Although it might seem that using column copies...
Rank items in an array using Python/NumPy, without sorting array twice
...)
%%timeit -n10000 -r5
x = (rankdata(l) - 1).astype(int)
>>> 128 µs ± 2.72 µs per loop (mean ± std. dev. of 5 runs, 10000 loops each)
%%timeit -n10000 -r5
a = np.array(l)
r = a.argsort().argsort()
>>> 69.1 µs ± 464 ns per loop (mean ± std. dev. of 5 runs, 10000 loops each)...
Python, compute list difference
...ange(10)
b = range(10/2)
timeit[diff(a, b)]
100000 loops, best of 3: 1.97 µs per loop
timeit[set_diff(a, b)]
100000 loops, best of 3: 2.71 µs per loop
timeit[diff_lamb_hension(a, b)]
100000 loops, best of 3: 2.1 µs per loop
timeit[diff_lamb_filter(a, b)]
100000 loops, best of 3: 3.58 µs per ...
process.waitFor() never returns
..., and even deadlock.
Fail to clear the buffer of input stream (which pipes to the output stream of subprocess)
from Process may lead to a subprocess blocking.
Try this:
Process process = Runtime.getRuntime().exec("tasklist");
BufferedReader reader =
new BufferedReader(new InputStreamReade...
What is the most efficient string concatenation method in python?
...ng/path/'
The contenders are
f'http://{domain}/{lang}/{path}' - 0.151 µs
'http://%s/%s/%s' % (domain, lang, path) - 0.321 µs
'http://' + domain + '/' + lang + '/' + path - 0.356 µs
''.join(('http://', domain, '/', lang, '/', path)) - 0.249 µs (notice that building a constant-length tuple i...
Most useful NLog configurations [closed]
...
Some of these fall into the category of general NLog (or logging) tips rather than strictly configuration suggestions.
Here are some general logging links from here at SO (you might have seen some or all of these already):
log4net vs. Nlog
Logging best practices
What's the point of a log...
腾讯Tencent开源框架介绍（持续更新） - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...入框架，支持iOS, macOS和Android。 Matrix 通过接入各种性能监控方案，对性能监控项的异常数据进行采集和分析，输出相应的问题分析、定位与优化建议，从而帮助开发者开发出更高质量的应用。当前工具监控范围包括：崩溃、卡...
Drop rows with all zeros in pandas data frame
...,0,1]})
In [91]: %timeit df[(df.T != 0).any()]
1000 loops, best of 3: 686 µs per loop
In [92]: df[(df.sum(axis=1) != 0)]
Out[92]:
a b
1 0 1
2 1 0
3 1 1
In [95]: %timeit df[(df.sum(axis=1) != 0)]
1000 loops, best of 3: 495 µs per loop
In [96]: %timeit df[df.values.sum(axis=1) != 0]
1...
Java内存泄露原因详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...通过垃圾回收机制完成的。GC为了能够正确释放对象，会监控每个对象的运行状况，对他们的申请、引用、被引用、赋值等状况进行监控，Java会使用有向图的方法进行管理内存，实时监控对象是否可以达到，如果不可到达，则就...
How to find the statistical mode?
...ered Dec 14 '12 at 8:00
Rasmus BååthRasmus Bååth
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