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Quickly find whether a value is present in a C array?
...roll the loop. Here's a way to do it which incorporates the 3 ideas I mentioned in my comment: Loop unrolling, cache prefetch and making use of the multiple load (ldm) instruction. The instruction cycle count comes out to about 3 clocks per array element, but this doesn't take into account memory de...
How to normalize a NumPy array to within a certain range?
...ized within a range before it can be written back to a file. This can be done like so:
7 Answers
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Changing the background drawable of the searchview widget
...decides to reimplement internals of SearchView and element with above-mentioned id is not present - the code won't work.
In SDK, the background for text field in SearchView is declared through nine-patches, so we'll do it the same way. You can find original png images in drawable-mdpi directory of ...
Should I use JSLint or JSHint JavaScript validation? [closed]
...ionally be cases where a linter will complain about something that you've done intentionally -- for example, you know that you should always use === but just this one time you have a good reason to use ==. But even then, with ESLint you have the option to specify eslint-disable around the line in qu...
Using Python's os.path, how do I go up one directory?
I recently upgrade Django from v1.3.1 to v1.4.
14 Answers
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Why does C++ compilation take so long?
...reds or even thousands of headers to be (1) loaded and (2) compiled.
Every one of them typically has to be recompiled for every compilation unit,
because the preprocessor ensures that the result of compiling a header might vary between every compilation unit.
(A macro may be defined in one compilati...
What is the difference between user and kernel modes in operating systems?
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How the switch occurs.
The switch from user mode to kernel mode is not done automatically by CPU. CPU is interrupted by interrupts (timers, keyboard, I/O). When interrupt occurs, CPU stops executing the current running program, switch to kernel mode, executes interrupt handler. This handler saves...
pull/push from multiple remote locations
...rge into HEAD, do:
git remote update
If it's not currently connected to one of the remotes, it will take time out or throw an error, and go on to the next. You'll have to manually merge from the fetched repositories, or cherry-pick, depending on how you want to organize collecting changes.
To fe...
What is an index in SQL?
...es are not unique. I might have a user database and want to query for everyone that lives in Gothenburg. An index on the "city" field would speed up my query. But there are more than 1 user living in Gothenburg so the index must be non-unique.
– Emil Vikström
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Drop all the tables, stored procedures, triggers, constraints and all the dependencies in one sql st
...eting stored procedures, triggers, constraints and all the dependencies in one SQL statement?
21 Answers
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