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In C++, is it still bad practice to return a vector from a function?
...hz 64bit processor. We could do better by parallelizing the computation in order to use all 8 cores (the test above only uses one core at a time, which I have verified by re-running the test while monitoring CPU usage). The best performance is achieved when mem(v) = 16kB, which is the order of magni...
How to reverse-i-search back and forth? [duplicate]
...myself am trying to find a piece of code that does the reverse-i-search in order to check how it has been implemented exactly.
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Detect if a NumPy array contains at least one non-numeric value?
...0us
%timeit np.isnan(array1M).any() # 532us
The early-exit method is 3 orders or magnitude speedup (in some cases).
Not too shabby for a simple annotation.
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How do I convert a git repository to mercurial?
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The hg convert utility isn't on by default after installation. In order to set it as such add the following to your .hgrc file.
[extensions]
hgext.convert=
If you're using TortoiseHg on Windows then this file resides in your home directory as mercurial.ini. After this setting change you ...
Why is `[` better than `subset`?
...adley suggests the following example: suppose we want to subset and then reorder a data frame using the following functions:
scramble <- function(x) x[sample(nrow(x)), ]
subscramble <- function(x, condition) {
scramble(subset(x, condition))
}
subscramble(mtcars, cyl == 4)
This returns t...
Cookie blocked/not saved in IFRAME in Internet Explorer
... <add name="p3p" value="CP=&quot;Internet Explorer Requires This In Order to Set Third Party Cookies&quot;" /> </customHeaders> </httpProtocol> </handlers> </system.webServer>'
– Rick Kierner
Feb 19...
What's the difference between xsd:include and xsd:import?
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Highly active question. Earn 10 reputation in order to answer this question. The reputation requirement helps protect this question from spam and non-answer activity.
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将 App Inventor 2 项目连接到外部传感器 · App Inventor 2 中文网
... port 13.
Ultrasonic sensors: port 36
Luminosity sensor: TwiMaster 1
In order to initialize all of the motors for use, the method “SetupMotors” must be called when the app starts and the screen is initialized. Here is an example of how simple the new blocks are to use:
Tutorials
A tutoria...
What is the formal difference in Scala between braces and parentheses, and when should they be used?
...ww.codecommit.com/scala-style-guide.pdf
The recommended syntax for higher order methods calls is to always use braces, and to skip the dot:
val filtered = tupleList takeWhile { case (s1, s2) => s1 == s2 }
For "normal" metod calls you should use the dot and parentheses.
val result = myInstanc...
What is the “N+1 selects problem” in ORM (Object-Relational Mapping)?
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@ariel The 'correct' way is to get all the wheels, ordered by CarId (1 select), and if more details than the CarId are required, make a second query for all cars (2 queries total). Printing things out is now optimal, and no indexes or secondary storage were required (you can ...