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Extracting bits with a single multiplication
...hey are multiplied by 1 to end up in the right place, and so "we got e for free". The same is true for b and d (b needs three spaces to the right, d needs the same three to its left). So when we compute the magic number, we find there are duplicates:
a: << 0 ( x 1 )
b: << 5 ( x 32 ...
jQuery Mobile: document ready vs. page events
...in new way of page event handling take a look here, in any other case feel free to continue with this article. You should read this answer even if you are using jQuery Mobile 1.4 +, it goes beyond page events so you will probably find a lot of useful information.
Older content:
This article can al...
What is a “cache-friendly” code?
...from a cache line, using the rest of the data in that cache line is almost free. A binary search becomes noticeably faster only when the data is large enough that the binary search reduces the number of cache lines you access.
Time
The time dimension means that when you do some operations on some ...
Perforce for Git users? [closed]
...IDE plugins will automatically checkout files when you start editing them, freeing you from having to do the checkout yourself.
Perforce Replacements For Git Features
git stash ==> p4 shelve
git local branching ==> either Perforce shelves or task branches
git blame ==> p4 annotate or Per...
Context switches much slower in new linux kernels
...ex implementation -- we are back to your theory of context switch.... feel free to delete this answer since it really belongs in comments... I just wanted the ability to format the commands.
– amdn
Aug 24 '12 at 16:57
...
Accessing class variables from a list comprehension in the class definition
...o cell variables
()
>>> foo.__code__.co_consts[2].co_consts[2].co_freevars # Refers to `x` in foo
('x',)
>>> foo().y
[2]
The actual referencing looks the value up from the current frame data structures, which were initialized from a function object's .__closure__ attribute. Sinc...
What is an existential type?
...ithout using closures. A closure is existentially typed, too, in that the free variables it is c
How can I sort arrays and data in PHP?
...properties from an array of objects.
If you have more common cases, feel free to edit this answer.
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How to add texture to fill colors in ggplot2
...ines and diagonal mesh of both) that can be hacked in ggplot.
Please feel free to suggest more if anyone can think on some.
EDIT 4: I've been working on a wrapper function to automate hatching/patterns in ggplot2. I'll post a link once I've expanded the function to allow patterns in facet_grid plo...
What is the best Distributed Brute Force countermeasure?
...ividual usernames are protected by the throttle, even if the attackers are free to try another user/pass during the timeout.
From an attackers point of view, during the timeout you may be able to take a first time guess at 100 passwords, and quickly discover one wrong password per account. You may...