大约有 12,000 项符合查询结果（耗时：0.0092秒） [XML]
How to find whether or not a variable is empty in Bash
...in practice this tests whether $variable is empty or not. As an addition (3½ years after the fact :-) ) I would never use this myself since -z does what I probably want in a clearer way, but I wanted to add this answer since this method is frequently seen "in the wild"; perhaps written this way on ...
Is there a minlength validation attribute in HTML5?
... Aug 12 '13 at 11:02
Ali ÇarıkçıoğluAli Çarıkçıoğlu
1,24611 gold badge1212 silver badges2121 bronze badges
...
Getting distance between two points based on latitude/longitude
...any hills they fly over, of course!).
Haversine
formula: a = sin²(Δφ/2) + cos φ1 ⋅ cos φ2 ⋅ sin²(Δλ/2)
c = 2 ⋅ atan2( √a, √(1−a) )
d = R ⋅ c
where φ is latitude, λ is longitude, R is earth’s radius (mean radius = 6,371km);
note that angles need ...
What's the simplest way to subtract a month from a date in Python?
...with adding or subtracting months: months have different lengths! In some application an exception is appropriate in such cases, in others "the last day of the previous month" is OK to use (but that's truly crazy arithmetic, when subtracting a month then adding a month is not overall a no-operation...
How to disable Django's CSRF validation?
...checks', True)
That middleware must be added to settings.MIDDLEWARE when appropriate (in your test settings for example).
Note: the setting isn't not called MIDDLEWARE_CLASSES anymore.
share
|
i...
How does Stack Overflow generate its SEO-friendly URLs?
...uld be nice with a version that doesn't just drop accented characters like åäö but instead deaccentuate them to aao... ^^
– Oskar Duveborn
Nov 16 '09 at 20:48
22
...
Find running median from a stream of integers
...icient way to calculate a percentile of a stream that I have found is the P² algorithm: Raj Jain, Imrich Chlamtac: The P² Algorithm for Dynamic Calculation of Quantiiles and Histograms Without Storing Observations. Commun. ACM 28(10): 1076-1085 (1985)
The algorithm is straight forward to implemen...
Peak signal detection in realtime timeseries data
...do not corrupt the threshold. Future signals are therefore identified with approximately the same accuracy, regardless of the amount of previous signals. The algorithm takes 3 inputs: lag = the lag of the moving window, threshold = the z-score at which the algorithm signals and influence = the influ...
Create Directory When Writing To File In Node.js
...-extra. If you don't want to install a package, please see Tiago Peres França's answer below.
share
|
improve this answer
|
follow
|
...
JavaScript “new Array(n)” and “Array.prototype.map” weirdness
...ered Mar 31 '11 at 14:45
David MårtenssonDavid Mårtensson
7,10044 gold badges2727 silver badges4646 bronze badges
...