大约有 740 项符合查询结果（耗时：0.0127秒） [XML]
How do I add the contents of an iterable to a set?
...s quickly before going public:
>\python27\python -mtimeit -s"it=xrange(10000);a=set(xrange(100))" "a.update(it)"
1000 loops, best of 3: 294 usec per loop
>\python27\python -mtimeit -s"it=xrange(10000);a=set(xrange(100))" "for i in it:a.add(i)"
1000 loops, best of 3: 950 usec per loop
>\p...
Why use the SQL Server 2008 geography data type?
...ALL
SELECT geography::Point(87.6543210987654, 87.6543210987654, 4326)
GO 10000
INSERT dbo.LatLng
SELECT 12.3456789012345, 12.3456789012345
UNION
SELECT 87.6543210987654, 87.6543210987654
GO 10000
EXEC sp_spaceused 'dbo.Geo'
EXEC sp_spaceused 'dbo.LatLng'
Result:
name rows data
...
What is the preferred/idiomatic way to insert into a map?
...:posix_time::microsec_clock::local_time();
for(int it = 0; it < 10000;it++) {
map_W.insert(std::pair<int,Widget>(it,Widget(2.0)));
}
ptime t2 = boost::posix_time::microsec_clock::local_time();
time_duration diff = t2 - t1;
std::cout << diff.total_millis...
Numpy: find first index of value fast
... numpy as np
np.random.seed(8675309)
a = np.random.random_integers(0, 100, 10000)
print lib.index(57, a.ctypes.data_as(ctypes.POINTER(ctypes.c_long)), len(a))
and I get 92.
Wrap up the python into a proper function and there you go.
The C version is a lot (~20x) faster for this seed (warning I a...
How do browsers pause/change Javascript when tab or window is not active?
... and switching to another tab!
let timeouts = [ 500, 1000, 2000, 3000, 10000 ];
let minExcess = document.getElementsByClassName('minExcess')[0];
timeouts.forEach(ms => {
let elem = document.getElementsByClassName(`t${ms}`)[0];
let cnt = 0;
let lastMs = +new Date();
let f = () =&g...
Which is faster in Python: x**.5 or math.sqrt(x)?
...
math.sqrt(x) is significantly faster than x**0.5.
import math
N = 1000000
%%timeit
for i in range(N):
z=i**.5
10 loops, best of 3: 156 ms per loop
%%timeit
for i in range(N):
z=math.sqrt(i)
10 loops, best of 3: 91.1 ms per loop
Using Python 3.6.9 (notebook).
...
What is the difference between is_a and instanceof?
...ame Repeats Result Performance
instanceof 10000 0.028343 sec +0.00%
is_a() 10000 0.043927 sec -54.98%
Test source is here.
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...
Is it possible to use argsort in descending order?
...).argsort()[:n]
1.93 µs ± 6.68 ns per loop (mean ± std. dev. of 7 runs, 1000000 loops each)
>>> timeit avgDists.argsort()[::-1][:n]
1.64 µs ± 3.39 ns per loop (mean ± std. dev. of 7 runs, 1000000 loops each)
>>> timeit avgDists.argsort()[-n:][::-1]
1.64 µs ± 3.66 ns per loo...
Why is lock(this) {…} bad?
... {
lock (this)
{
System.Threading.Thread.Sleep(10000);
}
}
}
class Program
{
static void Main(string[] args)
{
var nancy = new Person {Name = "Nancy Drew", Age = 15};
var a = new Thread(nancy.LockThis);
a.Start();
var b...
Very slow compile times on Visual Studio 2005
...8MB Cache.
Rebuild Time = 72 seconds.
3) Desktop Core 2 Duo 3Ghz, single 10000 RPM WD Raptor
Rebuild Time = 39 seconds.
The 10,000 RPM drive can not be understated. Builds where significantly quicker plus everything else like displaying documentation, using file explorer was noticable quicker. I...