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Why is transposing a matrix of 512x512 much slower than transposing a matrix of 513x513?
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The explanation comes from Agner Fog in Optimizing software in C++ and it reduces to how data is accessed and stored in the cache.
For terms and detailed info, see the wiki entry on caching, I'm gonna narrow it down here.
A cache is organized in sets and lines. At a time, only one set is used,...
What is the _snowman param in Ruby on Rails 3 forms for?
... form_tag or form_for helpers there is a hidden field named _snowman with the value of ☃ ( Unicode \x9731) showing up.
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How to check if a function exists on a SQL database
I need to find out if a function exists on a database, so that I can drop it and create it again. It should basically be something like the following code that I use for stored procedures:
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What's the simplest way to subtract a month from a date in Python?
If only timedelta had a month argument in it's constructor. So what's the simplest way to do this?
20 Answers
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Make a link open a new window (not tab) [duplicate]
Is there a way to make a link open a new browser window (not tab) without using javascript?
5 Answers
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How to have multiple CSS transitions on an element?
It's a pretty straightforward question but I can't find very good documentation on the CSS transition properties. Here is the CSS snippet:
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Sort NSArray of date strings or objects
...This is simpler than creating an NSSortDescriptor, and much simpler than writing your own comparison function. (NSDate objects know how to compare themselves to each other at least as efficiently as we could hope to accomplish with custom code.)
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Converting a list to a set changes element order
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A set is an unordered data structure, so it does not preserve the insertion order.
This depends on your requirements. If you have an normal list, and want to remove some set of elements while preserving the order of the list, you can do this with a list comprehensio...
Get changes from master into branch in Git
In my repository I have a branch called aq which I'm working on.
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Capitalize words in string [duplicate]
What is the best approach to capitalize words in a string?
21 Answers
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