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bpftrace教程【官方】 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...核静态跟踪)，当进入openat()系统调用时执行该探针。相比kprobes探针(内核动态跟踪，在第6节介绍)，我们更加喜欢用tracepoints探针，因为tracepoints有稳定的应用程序编程接口。注意：现代linux系统(glibc >= 2.26)，open总是调用openat系统...
Sort hash by key, return hash in Ruby
... answered Mar 11 '14 at 2:03
Mark ThomasMark Thomas
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How do I calculate percentiles with python/numpy?
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You might be interested in the SciPy Stats package. It has the percentile function you're after and many other statistical goodies.
percentile() is available in numpy too.
import numpy as np
a = np.array([1,2,3,4,5])
p = np.percentile(a, 50) # return 50th percentile, e...
Maximum single-sell profit
Suppose we are given an array of n integers representing stock prices on a single day. We want to find a pair (buyDay, sellDay) , with buyDay ≤ sellDay , such that if we bought the stock on buyDay and sold it on sellDay , we would maximize our profit.
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Move an array element from one array position to another
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If you'd like a version on npm, array-move is the closest to this answer, although it's not the same implementation. See its usage section for more details. The previous version of this answer (that modified Array.prototype.move) can be...
C++ performance challenge: integer to std::string conversion
Can anyone beat the performance of my integer to std::string code, linked below?
13 Answers
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Statistics: combinations in Python
...e function to do that in math , numpy or stat libraries. Something like a function of the type:
18 Answers
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Python: Tuples/dictionaries as keys, select, sort
...g., 24 blue bananas, 12 green apples, 0 blue strawberries and so on.
I'd like to organize them in a data structure in Python that allows for easy selection and sorting. My idea was to put them into a dictionary with tuples as keys, e.g.,
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Sort Go map values by keys
... through the returned map in the code, returned by the topic function, the keys are not appearing in order.
6 Answers
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How to create an array containing 1…N
I'm looking for any alternatives to the below for creating a JavaScript array containing 1 through to N where N is only known at runtime.
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