大约有 740 项符合查询结果（耗时：0.0183秒） [XML]
Remove querystring from URL
...g the substring method
i = 0;
console.time('10k substring');
while (i < 10000) {
testURL.substring(0, testURL.indexOf('?'));
i++;
}
console.timeEnd('10k substring');
// Testing the split method
i = 0;
console.time('10k split');
while (i < 10000) {
testURL.split('?')[0];
i++;
...
How to speed up insertion performance in PostgreSQL
...v4()
=# explain analyze select uuid_generate_v4(),* from generate_series(1,10000);
QUERY PLAN
---------------------------------------------------------------------------------------------------------------------------
Function Scan on generate...
Change default timeout for mocha
...
this.timeout(10000); // default timeout ^ TypeError: this.timeout is not a function at Suite.<anonymous> (/Users/jeff.l/Documents/workspace/unit-tests/mocha-chai_tests/checkoutTest.js:12:10)
– Jef...
Get list from pandas DataFrame column headers
...columns.tolist()
16.7 µs ± 317 ns per loop (mean ± std. dev. of 7 runs, 100000 loops each)
%timeit df.columns.values.tolist()
1.24 µs ± 12.3 ns per loop (mean ± std. dev. of 7 runs, 1000000 loops each)
For those who hate typing, you can just call list on df, as so:
list(df)
...
Is this a “good enough” random algorithm; why isn't it used if it's faster?
...);
int[] frequencies = new int[10];
for (int i = 0; i < 100000; i++) {
frequencies[(int) (qr.random() * 10)]++;
}
printDistribution("QR", frequencies);
frequencies = new int[10];
for (int i = 0; i < 100000; i++) {
frequen...
How to find and return a duplicate value in array
...s similar to Ryan
Now consider an array with 10,000 elements:
benchmark(10000, 0)
0 duplicates
Running each test once. Test will take about 4 minutes.
Ryan is similar to Sergio
Sergio is similar to Cary_set
Cary_set is similar to Cary_diff
Cary_diff is faster than Chris by 400x ± 100.0
Chris is ...
Sample random rows in dataframe
...slightly faster I believe: library(microbenchmark);microbenchmark( sample( 10000, 100 ), sample.int( 10000, 100 ), times = 10000 )
– Ari B. Friedman
Nov 1 '14 at 15:04
...
is_null($x) vs $x === null in PHP [duplicate]
...
//checking with ===
$a = array();
$time = microtime(true);
for($i=0;$i<10000;$i++) {
if($a[$i] === null) {
//do nothing
}
}
echo 'Testing with === ', microtime(true) - $time, "\n";
//checking with is_null()
$time = microtime(true);
for($i=0;$i<10000;$i++) {
if(is_null($a...
What is the difference between `sorted(list)` vs `list.sort()`?
...'s our setup:
import timeit
setup = """
import random
lists = [list(range(10000)) for _ in range(1000)] # list of lists
for l in lists:
random.shuffle(l) # shuffle each list
shuffled_iter = iter(lists) # wrap as iterator so next() yields one at a time
"""
And here's our results for a list of...
In-place type conversion of a NumPy array
...ethod, but proceed in block sizes that are within your memory limits:
a[0:10000] = a[0:10000].astype('float32').view('int32')
...then change the dtype when done.
Here is a function that accomplishes the task for any compatible dtypes (only works for dtypes with same-sized items) and handles arbi...