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Better way to shuffle two numpy arrays in unison
...o sequences of the same length results in the same number of calls to the random number generator, and these are the only "random" elements in the shuffle algorithm. By resetting the state, you ensure that the calls to the random number generator will give the same results in the second call to shu...
Peak signal detection in realtime timeseries data
...n the principle of dispersion: if a new datapoint is a given x number of standard deviations away from some moving mean, the algorithm signals (also called z-score). The algorithm is very robust because it constructs a separate moving mean and deviation, such that signals do not corrupt the threshol...
How many random elements before MD5 produces collisions?
... quintillion 374 quadrillion 607 trillion 431 billion 768 million 211 thousand 456.
However if you keep all the hashes then the probability is a bit higher thanks to birthday paradox. To have a 50% chance of any hash colliding with any other hash you need 264 hashes. This means that to get a collis...
Is there any async equivalent of Process.Start?
...- it doesn't have any cancellation/timeout support, but it'll gather the standard output and standard error for you, at least. github.com/jamesmanning/RunProcessAsTask
– James Manning
Dec 3 '12 at 5:54
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Create array of regex matches
...an the below if you can assume Java >= 9)
You need to create a matcher and use that to iteratively find matches.
import java.util.regex.Matcher;
import java.util.regex.Pattern;
...
List<String> allMatches = new ArrayList<String>();
Matcher m = Pattern.compile("your regular ex...
How does Python manage int and long?
Does anybody know how Python manage internally int and long types?
9 Answers
9
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Regular Expressions: Is there an AND operator?
...an use the | (pipe?) to represent OR , but is there a way to represent AND as well?
12 Answers
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~x + ~y == ~(x + y) is always false?
...
Assume for the sake of contradiction that there exists some x and some y (mod 2n) such that
~(x+y) == ~x + ~y
By two's complement*, we know that,
-x == ~x + 1
<==> -1 == ~x + x
Noting this result, we have,
~(x+y) == ~x + ~y
<==> ~(x+y) + (x+y) == ~x + ~y...
Run git pull over all subdirectories [duplicate]
...h 1 for a maximum depth of one sub-directory
-exec {} \; runs a custom command for every find
git --git-dir={}/.git --work-tree=$PWD/{} pull git pulls the individual directories
To play around with find, I recommend using echo after -exec to preview, e.g.:
find . -type d -depth 1 -exec echo git -...
How to log a method's execution time exactly in milliseconds?
...Since(methodStart)
print("Execution time: \(executionTime)")
Easy to use and has sub-millisecond precision.
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