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Why is transposing a matrix of 512x512 much slower than transposing a matrix of 513x513?
...same set. Before reading 0x4700, all lines in the set would have been occupied. Reading that memory evicts an existing line in the set, the line that initially was holding 0x2710. The problem lies in the fact that we read addresses that are (for this example) 0x800 apart. This is the critical stride...
Why is volatile not considered useful in multithreaded C or C++ programming?
...t it doesn't provide all the guarantees we need. It does have a few properties we need, but not all of them, so we can't rely on volatile alone.
However, the primitives we'd have to use for the remaining properties also provide the ones that volatile does, so it is effectively unnecessary.
For thr...
Making custom right-click context menus for my web-app
... google as I did. I based my solution on @Andrew's one, but basically modified everything afterwards.
EDIT: seeing how popular this has been lately, I decided to update also the styles to make it look more like 2014 and less like windows 95. I fixed the bugs @Quantico and @Trengot spotted so now it...
load and execute order of scripts
...them have loaded and run.
Async scripts (regardless of how they are specified as async) load and run in an unpredictable order. The browser loads them in parallel and it is free to run them in whatever order it wants.
There is no predictable order among multiple async things. If one needed a pre...
Using IQueryable with Linq
...lete, but I thought I'd add something about this from the user's point of view, as well...
The main difference, from a user's perspective, is that, when you use IQueryable<T> (with a provider that supports things correctly), you can save a lot of resources.
For example, if you're working a...
How to make a great R reproducible example
...s can be done using data.frame(). One should pay attention to name the entries in the data frame, and to not make it overly complicated.
An example :
set.seed(1)
Data <- data.frame(
X = sample(1:10),
Y = sample(c("yes", "no"), 10, replace = TRUE)
)
For some questions, specific formats...
Java 8 Iterable.forEach() vs foreach loop
...tupid principle, the new-fangled forEach() has at least the following deficiencies:
Can't use non-final variables. So, code like the following can't be turned into a forEach lambda:
Object prev = null;
for(Object curr : list)
{
if( prev != null )
foo(prev, curr);
prev = curr;
}
...
boost::flat_map and its performance compared to map and unordered_map
... nowadays, but much worse of all, the compiler creates a full ordering barrier around inline assembly because it cannot static analyze the inside, so this is a problem to benchmark real world stuff, especially when calling stuff just once. So an intrinsic is suited here, because it doesn't break the...
Programmatically Lighten or Darken a hex color (or rgb, and blend colors)
... HEX writes too slow and comes in too many flavors for a simple two-liner (IE. it could be a 3, 4, 6, or 8 digit HEX code). You will also need to sacrifice some features, no error checking, no HEX2RGB nor RGB2HEX. As well, you will need to choose a specific function (based on its function name below...
What is the advantage to using bloom filters?
...omplish with a bloom filter, you could accomplish in less space, more efficiently, using a single hash function rather than multiple, or that's what it seems. Why would you use a bloom filter and how is it useful?
...