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Why must a lambda expression be cast when supplied as a plain Delegate parameter
...o asynch stuff
wait = false;
});
while (wait) Thread.Sleep(100);
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How to get users to read error messages?
...ssage explicitly stated in the context of 'Look under the chair'), with a $100 dollar bill taped to the underside of the chair that the subjects were sitting on...no one spotted the message in the status bar!
Make the messages short, do not use intimidating words such as 'Alert: the system encounter...
Efficient evaluation of a function at every cell of a NumPy array
..._arr = np.frompyfunc(f, 2, 1)
vf = np.vectorize(f)
arr = np.linspace(0, 1, 10000)
%timeit f_arr(arr, arr) # 307ms
%timeit f_arr(arr, arr) # 450ms
I have also tested larger samples, and the improvement is proportional. For comparison of performances of other methods, see this post
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When should I use double instead of decimal?
...rivate const float THREE_FIFTHS = 3f / 5f;
private const int ONE_MILLION = 1000000;
public static void Main(string[] args)
{
Console.WriteLine("Three Fifths: {0}", THREE_FIFTHS.ToString("F10"));
float asSingle = 0f;
double asDouble = 0d;
decimal asDecimal = 0M;
for (int i = 0; ...
What's the difference between a Future and a Promise?
...;Integer> momsPurse = ()-> {
try {
Thread.sleep(1000);//mom is busy
} catch (InterruptedException e) {
;
}
return 100;
};
ExecutorService ex = Executors.newFixedThreadPool(10);
CompletableFuture<Integer> promise =
Comple...
Why do people say that Ruby is slow? [closed]
...need to set up a new server for every 10% traffic increase or so with some 100 visits per day, the customer would clearly have a right to complain. Realistically though, you usually need to have a lot more traffic to begin with and increase that by an order of magnitude, before the old hardware can'...
How do you find the row count for all your tables in Postgres
... @a_horse_with_no_name, by executing x_path function against a 100 million records.
– Spike
Apr 8 '19 at 10:24
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MySQL indexes - what are the best practices?
...FULLTEXT index or a prefix index:
CREATE INDEX i ON SomeTable(longVarchar(100));
Note that a conventional index can't help if you're searching for words that may be in the middle of that long varchar. For that, use a fulltext index.
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specify project file of a solution using msbuild
...
100
One important note: if your project has a '.' in the name, you'll need to replace it with a '_' when specifying it with /t
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How to exclude a directory in find . command
...o use -delete switch: find . -not \( -path ./CVS -prune \) -type f -mtime +100 -delete find: The -delete action atomatically turns on -depth, but -prune does nothing when -depth is in effect. If you want to carry on anyway, just explicitly use the -depth option.
– Jānis Elmer...