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How to select where ID in Array Rails ActiveRecord without exception
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If it is just avoiding the exception you are worried about, the "find_all_by.." family of functions works without throwing exceptions.
Comment.find_all_by_id([2, 3, 5])
will work even if some of the ids don't exist. This works in the
user.comments.find_all_by_id(potentially_nonexistent_id...
Android accelerometer accuracy (Inertial navigation)
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It's quite different to the old manually-take-some-pictures-then-stitch-them-later job. It does track its position in real time somehow. It's a little difficult to explain without demonstrating it. You don't have to take pictures manually - the phone decides...
How can I get file extensions with JavaScript?
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Newer Edit: Lots of things have changed since this question was initially posted - there's a lot of really good information in wallacer's revised answer as well as VisioN's excellent breakdown
Edit: Just because this is the accepted answer; wallacer's answer is indeed much better:
return f...
How do I seed a random class to avoid getting duplicate random values [duplicate]
... be far from uniform distribution.
For the sake of completeness, if you really need to reseed a Random, you'll create a new instance of Random with the new seed:
rnd = new Random(newSeed);
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Why is transposing a matrix of 512x512 much slower than transposing a matrix of 513x513?
... a matrix of size 2^n is slower than transposing one of size 2^n+1 . For small values of n , the difference is not major.
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What's the difference between “Architectures” and “Valid Architectures” in Xcode Build Settings?
...ALID_ARCHS = armv6 armv7 armv7s, but you set ARCHS = armv7s because that's all you actually want to build with your code.
Or, in Apple-ese:
ARCHS (Architectures)
Space-separated list of identifiers. Specifies the architectures (ABIs, processor models) to which the binary is targeted. When ...
Writing to an Excel spreadsheet
...npyxl). Others suggest to write to a .csv file (never used CSV and don't really understand what it is).
12 Answers
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Read whole ASCII file into C++ std::string [duplicate]
...pdate: Turns out that this method, while following STL idioms well, is actually surprisingly inefficient! Don't do this with large files. (See: http://insanecoding.blogspot.com/2011/11/how-to-read-in-file-in-c.html)
You can make a streambuf iterator out of the file and initialize the string with it...
Difference between `data` and `newtype` in Haskell
...e. In particular, data introduces a type that is "lifted", meaning, essentially, that it has an additional way to evaluate to a bottom value. Since there's no additional constructor at runtime with newtype, this property doesn't hold.
That extra pointer in the Book to (,) constructor allows us to ...
How can I disable a button in a jQuery dialog from a function?
...tinue" button. I would like this "continue" button to only be enabled once all the fields have content in them, else it will remain disabled.
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