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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
...
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
...
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.
...
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
...
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...
TCP: can two different sockets share a port?
...
@user207421 Of course 100k or more TCP connections can be handled with the same ports, listen()/accept() API calls can create the sockets on a way that the kernel will differentiate them by their incoming ports. The question of the OP can be inter...
When are you truly forced to use UUID as part of the design?
...r words, only after generating 1 billion
UUIDs every second for the next 100 years, the probability of creating
just one duplicate would be about 50%.
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