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Why does the MongoDB Java driver use a random number generator in a conditional?
...in the code you have posted we can actually see how the author intended to transform the original if-then somehow literally into its negation required for the early return condition. But then he messed up and inserted an effective "double negative" by reversing the inequality sign.
Coding style issu...
How can I know which parts in the code are never used?
...on may actually remove dead code, in practice the program has been so much transformed at the time it is performed that it is near impossible to convey meaningful information to the user.
There are therefore two approaches:
The theoretic one is to use a static analyzer. A piece of software that w...
How do I find Waldo with Mathematica?
...raining a Waldo classifier would be:
Determining the right image feature transform. This is where @Heike's answer would be useful: a red filter and a stripped pattern detector (e.g., wavelet or DCT decomposition) would be a good way to turn raw pixels into a format that the classification algorit...
how to ignore namespaces with XPath
... <node id="Plane" name="Plane" type="NODE">
<matrix sid="transform">1 0 0 0 0 1 0 0 0 0 1 0 0 0 0 1</matrix>
<instance_geometry url="#Plane-mesh" name="Plane">
<bind_material>
<technique_common>
<instance_mat...
Arduino101（Genuino 101）&App Inventor – RGB LED控制 - 创客硬件开...
.../2017/02/ ... %e6%8e%a7%e5%88%b6/
本文將介紹如何取得觸碰點的 RGB 參數之後透過 BLE 送給 Arduino 101 來點亮 RGB LED。
App InventorDesigner使用 Canvas 來取得觸碰點座標。兩個連線斷線用的按鈕：Btn_Connect / Btn_DisConnect三個用來呈現RG...
How do I catch a numpy warning like it's an exception (not just for testing)?
...a pretty big change in behaviour.
Use numpy.seterr(all='warn'), which will transform the printed warning in a real warning and you'll be able to use the above solution to localize this change in behaviour.
Once you actually have a warning, you can use the warnings module to control how the warning...
Is it safe to get values from a java.util.HashMap from multiple threads (no modification)?
... (4). In particular, (3) applies directly to the code I have above: if you transform the declaration of MAP to:
public static volatile HashMap<Object, Object> MAP;
then everything is kosher: readers who see a non-null value necessarily have a happens-before relationship with the store to MA...
Cluster analysis in R: determine the optimal number of clusters
...ges("bclust")
library(bclust)
x <- as.matrix(d)
d.bclus <- bclust(x, transformed.par = c(0, -50, log(16), 0, 0, 0))
viplot(imp(d.bclus)$var); plot(d.bclus); ditplot(d.bclus)
dptplot(d.bclus, scale = 20, horizbar.plot = TRUE,varimp = imp(d.bclus)$var, horizbar.distance = 0, dendrogram.lwd = 2)
...
How to prove that a problem is NP complete?
... time)
Select a known NP-complete problem L'
Describe an algorithm f that transforms L' into L
Prove that your algorithm is correct (formally: x ∈ L' if and only if f(x) ∈ L )
Prove that algo f runs in polynomial time
...
Best practices for exception management in Java or C# [closed]
...exceptions, or
you would have to catch exception D in
the new foo, and transform the D into
an A, B, or C.
Bill Venners: But aren't you breaking
their code in that case anyway, even
in a language without checked
exceptions? If the new version of foo
is going to throw a new excepti...