大约有 900 项符合查询结果（耗时：0.0206秒） [XML]
Returning the product of a list
... |
-------+-----------+-----------+-----------+-----------+
A 20.8 µs 13.3 µs 22.6 µs 39.6 µs
B 106 µs 95.3 µs 5.92 µs 26.1 µs
C 4.34 ms 3.51 ms 16.7 µs 38.9 µs
D 46.6 ms 38.5 ms 180 µs 216 µs
Result: ...
How do I efficiently iterate over each entry in a Java Map?
...rror Units
test3_UsingForEachAndJava8 avgt 10 0.308 ± 0.021 µs/op
test10_UsingEclipseMap avgt 10 0.309 ± 0.009 µs/op
test1_UsingWhileAndMapEntry avgt 10 0.380 ± 0.014 µs/op
test6_UsingForAndIterator avgt 10 0.387 ± 0.016 µs/op
test2_Us...
Difference between getContext() , getApplicationContext() , getBaseContext() and “this”
... | NO | NO |
| Start an Activity | NO¹ | YES | NO¹ | NO¹ | NO¹ |
| Layout Inflation | NO² | YES | NO² | NO² | NO² |
| Start a Service | YES ...
Find element's index in pandas Series
...randint(0,10,10000))
In [9]: %timeit s[s == 5]
1000 loops, best of 3: 203 µs per loop
In [12]: i = Index(s)
In [13]: %timeit i.get_loc(5)
1000 loops, best of 3: 226 µs per loop
As Viktor points out, there is a one-time creation overhead to creating an index (its incurred when you actually DO ...
Cartesian product of x and y array points into single array of 2D points
...1000)]
Test results:
In [2]: test_all(*(x100 * 2))
repeat_product:
67.5 µs ± 633 ns per loop (mean ± std. dev. of 7 runs, 10000 loops each)
dstack_product:
67.7 µs ± 1.09 µs per loop (mean ± std. dev. of 7 runs, 10000 loops each)
cartesian_product:
33.4 µs ± 558 ns per loop (mean ± std....
How to determine whether a Pandas Column contains a particular value
...10]: x = pd.Series(range(1000000))
In [13]: timeit 999999 in x.values
567 µs ± 25.6 µs per loop (mean ± std. dev. of 7 runs, 1000 loops each)
In [15]: timeit x.isin([999999]).any()
9.54 ms ± 291 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)
In [16]: timeit (x == 999999).any()
6....
How do I sort unicode strings alphabetically in Python?
...->collating_element mapping. It does not handle things like expansions (æ sorted as "ae"), French accent sorting (letters sorted left-to-right, but accents right-to-left), rearrangement and probably a few more. Details here (full UCA feature set): unicode.org/reports/tr10 and here (locale collat...
Why isn't my Pandas 'apply' function referencing multiple columns working? [closed]
... that an intermediate result is being cached. 1000 loops, best of
3: 481 µs per loop
Example 2: vectorize using pandas.apply():
%%timeit
df['a'] % df['c']
The slowest run took 458.85 times longer than the fastest. This could
mean that an intermediate result is being cached. 10000 loops...
Add spaces before Capital Letters
Given the string "ThisStringHasNoSpacesButItDoesHaveCapitals" what is the best way to add spaces before the capital letters. So the end string would be "This String Has No Spaces But It Does Have Capitals"
...
iPhone: How to get current milliseconds?
...if portability is a priority for you.
iPhone 4S
CACurrentMediaTime: 1.33 µs/call
gettimeofday: 1.38 µs/call
[NSDate timeIntervalSinceReferenceDate]: 1.45 µs/call
CFAbsoluteTimeGetCurrent: 1.48 µs/call
[[NSDate date] timeIntervalSince1970]: 4.93 µs/call
iPad 3
CACurrentMediaTime: 1.25 µs/c...