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How to calculate moving average using NumPy?
...a[rolling_idx].mean(axis=0)[n-1:]
def rollavg_roll_edges(a,n):
# see https://stackoverflow.com/questions/42101082/fast-numpy-roll
'Numpy array rolling, edge handling'
assert n%2==1
a = np.pad(a,(0,n-1-n//2), 'constant')*np.ones(n)[:,None]
m = a.shape[1]
idx = np.mod((m-1)*n...
HTML5 best practices; section/header/aside/article elements
...ocument, HTML5 allows us to also have footer within sections.
Source: https://clzd.me/html5-section-aside-header-nav-footer-elements-not-as-obvious-as-they-sound/
Additionally, here's a description on article, not found in the source above:
article – Used for element that specifies inde...
Virtual Memory Usage from Java under Linux, too much memory used
...LLOC_ARENA_MAX=4
There is an IBM article about setting MALLOC_ARENA_MAX
https://www.ibm.com/developerworks/community/blogs/kevgrig/entry/linux_glibc_2_10_rhel_6_malloc_may_show_excessive_virtual_memory_usage?lang=en
This blog post says
resident memory has been known to creep in a manner simi...
How do multiple clients connect simultaneously to one port, say 80, on a server? [duplicate]
...icknet -m tcp -t localhost:500 -p Test payload.
This is a simple script (https://github.com/grokit/dcore/tree/master/apps/quicknet) that opens a TCP socket, sends the payload ("Test payload." in this case), waits a few seconds and disconnects. Doing netstat again while this is happening displays t...
Map vs Object in JavaScript
...
Use objects when there is logic that operates on individual elements.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map
The iterability-in-order is a feature that has long been wanted by developers, in part because it ensures the same performance in all brows...
How to create a self-signed certificate with OpenSSL
I'm adding HTTPS support to an embedded Linux device. I have tried to generate a self-signed certificate with these steps:
...
Best way to test for a variable's existence in PHP; isset() is clearly broken
...ed and false is omitted.
You can run the tests yourself, check this gist:
https://gist.github.com/mfdj/8165967
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“Keep Me Logged In” - the best approach
..., bool $secure = false [, bool $httponly = false ]]]]]] )
secure (Using HTTPS connection)
httponly (Reduce identity theft through XSS attack)
Definitions
Token ( Unpredictable random string of n length eg. /dev/urandom)
Reference ( Unpredictable random string of n length eg. /dev/urandom)
Si...
Where do you store your salt strings?
...eUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 4...
Floating point vs integer calculations on modern hardware
...e, lower is faster and preferable):
Update to accomodate @Peter Cordes
https://gist.github.com/Lewiscowles1986/90191c59c9aedf3d08bf0b129065cccc
i7 4700MQ Linux Ubuntu Xenial 64-bit (all patches to 2018-03-13 applied)
short add: 0.773049
short sub: 0.789793
short mul: 0.960152
s...