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Most efficient method to groupby on an array of objects
What is the most efficient way to groupby objects in an array?
43 Answers
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How to use a filter in a controller?
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The answer by @pkozlowski.opensource is better than this because it reduces "magic strings". One benefit - what if this was in a much more complex controller and you failed to unit test the filter being used? You wouldn't notice the err...
Rename a git submodule
...pping (like status and diff) behave strangely.
Let "git mv" help here by not only moving the submodule's work tree but also updating the "submodule.<submodule name>.path" setting from the .gitmodules file and stage both.
This doesn't happen when no .gitmodules file is found and only iss...
How do I tell if a regular file does not exist in Bash?
...;& versus using -f with ||. This has to do with the exit code returned by the non/existence check. If you need your line to always exit cleanly with exit code 0 (and sometimes you don't want this constraint), the two approaches are not interchangeable. Alternatively, just use an if statement and...
What does “S3 methods” mean in R?
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Most of the relevant information can be found by looking at ?S3 or ?UseMethod, but in a nutshell:
S3 refers to a scheme of method dispatching. If you've used R for a while, you'll notice that there are print, predict and summary methods for a lot of different kinds of o...
How is the default max Java heap size determined?
...FlagsFinal -version | grep HeapSize
I believe the resulting output is in bytes.
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How do I focus on one spec in jasmine.js?
...m a rather large architectural change. I'd like to work on fixing them one by one by tagging each one with 'focus'.
9 Answe...
Package structure for a Java project?
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I would suggest creating your package structure by feature, and not by the implementation layer. A good write up on this is Java practices: Package by feature, not layer
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Error while installing json gem 'mkmf.rb can't find header files for ruby'
...h has a firewall. I'm setting up my environment through a proxy. I have ruby 1.8.7 . When I try to gem install..
16 Answer...
How can I quantify difference between two images?
... images as arrays (scipy.misc.imread) and calculate an element-wise (pixel-by-pixel) difference. Calculate the norm of the difference.
Option 2: Load both images. Calculate some feature vector for each of them (like a histogram). Calculate distance between feature vectors rather than images.
Howev...