大约有 44,000 项符合查询结果（耗时：0.0170秒） [XML]
Fitting empirical distribution to theoretical ones with Scipy (Python)?
INTRODUCTION : I have a list of more than 30,000 integer values ranging from 0 to 47, inclusive, e.g. [0,0,0,0,..,1,1,1,1,...,2,2,2,2,...,47,47,47,...] sampled from some continuous distribution. The values in the list are not necessarily in order, but order doesn't matter for this problem.
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How can I correctly prefix a word with “a” and “an”?
... the most popular:
http://www.google.co.uk/search?q=%22a+europe%22 - 841,000 hits
http://www.google.co.uk/search?q=%22an+europe%22 - 25,000 hits
Or:
http://www.google.co.uk/search?q=%22a+honest%22 - 797,000 hits
http://www.google.co.uk/search?q=%22an+honest%22 - 8,220,000 hits
Therefore "a e...
Date query with ISODate in mongodb doesn't seem to work
...ch with $date like below:
db.foo.find({dt: {"$date": "2012-01-01T15:00:00.000Z"}})
you'll get error:
error: { "$err" : "invalid operator: $date", "code" : 10068 }
Try this:
db.mycollection.find({
"dt" : {"$gte": new Date("2013-10-01T00:00:00.000Z")}
})
or (following comments by @user380...
Python string class like StringBuilder in C#?
...61, 6GB RAM, Debian GNU/Linux 6.0.6 (squeeze).
Here is the result for 10,000 iterations:
method1: 0.0538418292999 secs
process size 4800 kb
method2: 0.22602891922 secs
process size 4960 kb
method3: 0.0605459213257 secs
process size 4980 kb
method4: 0.0544030666351 secs
process size 5536 kb
m...
Calculate the median of a billion numbers
...
sort -g numbers | head -n 500000001 | tail -n 2 | dc -e "1 k ? ? + 2 / p"
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How expensive is RTTI?
...
I was doing a quick test using this:
GCC Clock() + XCode's Profiler.
100,000,000 loop iterations.
2 x 2.66 GHz Dual-Core Intel Xeon.
The class in question is derived from a single base class.
typeid().name() returns "N12fastdelegate13FastDelegate1IivEE"
5 Cases were tested:
1) dynamic_cast< Fi...
Custom thread pool in Java 8 parallel stream
...t;
// Parallel task here, for example
IntStream.range(1, 1_000_000).parallel()
.filter(PrimesPrint::isPrime)
.boxed().collect(Collectors.toList())
).get();
System.out.println(primes);
} catch (InterruptedException | ExecutionException e) {
...
Improve INSERT-per-second performance of SQLite
...formance of a C application can vary from 85 inserts per second to over 96,000 inserts per second!
10 Answers
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Multiple Updates in MySQL
...6.7x faster for me than the TRANSACTION method. I tried on a set of both 3,000 and 30,000 rows.
The TRANSACTION method still has to run each individually query, which takes time, though it batches the results in memory, or something, while executing. The TRANSACTION method is also pretty expensive ...
Performance difference for control structures 'for' and 'foreach' in C#
...orlib]System.Collections.Generic.List`1/Enumerator<object> V_1)
IL_0000: ldarg.0
IL_0001: callvirt instance valuetype [mscorlib]System.Collections.Generic.List`1/Enumerator<!0> class [mscorlib]System.Collections.Generic.List`1<object>::GetEnumerator()
IL_0006: stloc.1
...