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how does multiplication differ for NumPy Matrix vs Array classes?
...s (?) more common in engineering and science texts than in mathematics, at least in my experience. Its prevalence in numpy is mostly because numpy.matrixmultiply is tough to type.
– Joe Kington
Mar 15 '13 at 0:00
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What is the meaning of single and double underscore before an object name?
...Mangling)
From the Python docs:
Any identifier of the form __spam (at least two leading underscores, at most one trailing underscore) is textually replaced with _classname__spam, where classname is the current class name with leading underscore(s) stripped. This mangling is done without regard ...
Declaring variables inside or outside of a loop
...tical to the code above. If you just code a dummy loop JVM skips it, so at least you need to assign and return something. This is also recommended in Caliper documentation.
@Param int size; // Set automatically by framework, provided in the Main
/**
* Variable is declared inside the loop.
*
* @para...
Most efficient way to create a zero filled JavaScript array?
...len; arr.fill(0); is about the fastest solution ive seen anywhere... or at least tied
– Pimp Trizkit
Sep 22 '15 at 16:08
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What are enums and why are they useful?
...e efficient (see 1), so it's a worthwhile feature.
It's worthwhile for at least one more reason, too:
Switch statements
One thing that the static final enum simulation above does not give you is nice switch cases. For enum types, the Java switch uses the type of its variable to infer the scope o...
java中的缓存技术该如何实现 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...间不够得情况下,hit 值最小的将会被清出缓存。
2 LRU ，Least Recently Used ，最近最少使用的，缓存的元素有一个时间戳，当缓存容量满了，而又需要腾出地方来缓存新的元素的时候，那么现有缓存元素中时间戳离当前时间最远的元...
How JavaScript closures are garbage collected
...environment record. I believe this is how Firefox implements closures, at least.
This has the benefits of fast access to closed-over variables and simplicity of implementation. It has the drawback of the observed effect, where a short-lived closure closing over some variable causes it to be kept ...
Flex-box: Align last row to grid
...ntioned - there's no clean way to left-align the last row with flexbox (at least as per the current spec)
However, for what it's worth: With the CSS Grid Layout Module this is surprisingly easy to produce:
Basically the relevant code boils down to this:
ul {
display: grid; /* 1 */
grid-templ...
Calling virtual functions inside constructors
...rtual in C++ terminology) methods is a common source of errors. In C++, at least you have the guarantee that it will never call a method on a yet unconstructed object...
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Reference requirements.txt for the install_requires kwarg in setuptools setup.py file
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I know this is an old question, but you can at least nowadays configure PyCharm to parse a requirements file at Preferences->Tools->Python integrated tools->Package requirements file
– lekksi
Dec 28 '14 at 18:56
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