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Regular expression to match non-ASCII characters?
...or unicode you can look at this 2 resources:
Code charts list of Unicode ranges
This tool to create a regex filtered by Unicode block.
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follo...
How do I detect unsigned integer multiply overflow?
...ltiplication just to be sure it really is safe. Given the potentially huge range of values that report false negatives, this has no real value, when algorithms exist to return the correct answer, without a validation step.
– Brett Hale
Jan 17 '15 at 8:47
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What is the difference between a pseudo-class and a pseudo-element in CSS?
...eudo-element.
It doesn't mean all elements that are selected; it means the range of content that is selected, which may span portions of multiple elements.
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adding noise to a signal in python
...sinal):
regsnr=54
sigpower=sum([math.pow(abs(sinal[i]),2) for i in range(len(sinal))])
sigpower=sigpower/len(sinal)
noisepower=sigpower/(math.pow(10,regsnr/10))
noise=math.sqrt(noisepower)*(np.random.uniform(-1,1,size=len(sinal)))
return noise
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PHP DateTime::modify adding and subtracting months
...ution that is still as clunky as any but I think has nice results:
foreach(range(0,5) as $count) {
$new_date = clone $date;
$new_date->modify("+$count month");
$expected_month = $count + 1;
$actual_month = $new_date->format("m");
if($expected_month != $actual_month) {
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DynamoDB vs MongoDB NoSQL [closed]
...L database solution.
In DynamoDB you can query on a hash or on a hash and range key, and you can have multiple secondary global indexes. I'm doing queries on a single table with 4 possible filter parameters and sorting the results, this is supported (barely) through the use of the global secondary...
Comparing boxed Long values 127 and 128
...code work for all values.
Java caches Integer objects instances from the range -128 to 127. That said:
If you set to N Long variables the value 127 (cached), the same object instance will be pointed by all references. (N variables, 1 instance)
If you set to N Long variables the value 128 (not ca...
When to use Hadoop, HBase, Hive and Pig?
...t optimal on scans, although data is stored sorted. So while scanning some ranges can be good choice, full scans will be much slower then directly from HDFS
– David Gruzman
Mar 25 '15 at 17:58
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How to obtain the start time and end time of a day?
... see more discussion and examples.
See this post, Time intervals and other ranges should be half-open, by Bill Schneider.
Avoid legacy date-time classes
The java.util.Date and .Calendar classes are notoriously troublesome. Avoid them.
Use java.time classes. The java.time framework is the official su...
Implicit type conversion rules in C++ operators
... "The minimum size of operations is int." - This would be very strange (what about architectures that efficiently support char/short operations?) Is this really in the C++ spec?
– Rafał Dowgird
Apr 6 '11 at 7:59
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