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How to create the most compact mapping n → isprime(n) up to a limit N?
...e false positives (see Carmichael numbers) and do a binary search. This is by far the fastest test I've ever implemented, the only drawback is that the range is limited.
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All permutations of a Windows license key
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Object reference not set to an instance of an object.Why doesn't .NET show which object is `null`?
...ined. If it is predefined then it can be null(like string which occupies 2 Bytes) but if it is user-defined than we have to create an instance of it so that it knows that this object will occupy this much memory. So therefore it throws error at run-time.
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Browsers' default CSS for HTML elements
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How to check whether a pandas DataFrame is empty?
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How to make Twitter Bootstrap menu dropdown on hover rather than click
...ll get swept into the little button at top right, which is still triggered by a click. Big Thanks!
– ptim
Jan 28 '13 at 6:23
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Same-named attributes in attrs.xml for custom view
...elationship, which can only be deduced in the associated style definitions by naming conventions and the specific items defined therein (noticing that a few belong to one styleable and a few to another). I'd rather make it explicit with the parent attribute but haven't seen many posts suggesting it'...
How fast is D compared to C++?
...kend. Benchmarks that do heavily stress the GC will show that D performs abysmally. Rest assured, though, this is a single (albeit severe) quality-of-implementation issue, not a baked-in guarantee of slowness. Also, D gives you the ability to opt out of GC and tune memory management in performanc...
How to upload a file in Django? [closed]
...m what URL Django serves them. MEDIA_ROOT and MEDIA_URL are in settings.py by default but they are empty. See the first lines in Django Managing Files for details. Remember also set the database and add myapp to INSTALLED_APPS
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import os
BASE_DIR = os.path.dirname(os.path.dirname(__file__))
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MongoDB/NoSQL: Keeping Document Change History
...ch change
I came across the Versioning module of the Mongoid driver for Ruby. I haven't used it myself, but from what I could find, it adds a version number to each document. Older versions are embedded in the document itself. The major drawback is that the entire document is duplicated on each cha...