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Speed up the loop operation in R
... For instance, use vapply rather than sapply, and specify colClasses when reading in text-based data. Speed gains will be variable depending on how much guessing you eliminate.
Next, consider optimized packages: The data.table package can produce massive speed gains where its use is possible, in ...
Representing and solving a maze given an image
...e maze to make sure virtual traveler will not walk around it :)
Implement breadth-first search (BFS) in your favorite language and run it from the start. I prefer MATLAB for this task. As @Thomas already mentioned, there is no need to mess with regular representation of graphs. You can work with bin...
What is the (best) way to manage permissions for Docker shared volumes?
...
Is this targeted at reading files from the mounted volume? I'm looking for a solution for writing files without them being owned by another user than they who created the docker container.
– ThorSummoner
Au...
Why not use exceptions as regular flow of control?
... control violates a principle of least astonishment, make programs hard to read (remember that programs are written for programmers first).
Moreover, this is not what compiler vendors expect. They expect exceptions to be thrown rarely, and they usually let the throw code be quite inefficient. Throw...
How can I assign an ID to a view programmatically?
...be positive, but is otherwise arbitrary- it can be whatever you want (keep reading if this is frightful.)
For example, if creating and numbering several views representing items, you could use their item number.
Uniqueness of ids
XML-assigned ids will be unique.
Code-assigned ids do not have to ...
Transactions in REST?
...ate a transaction as an object. This could contain all the data you know already, and put the transaction in a pending state.
POST /transfer/txn
{"source":"john's account", "destination":"bob's account", "amount":10}
{"id":"/transfer/txn/12345", "state":"pending", "source":...}
Once you have thi...
Difference between __str__ and __repr__?
...t be, but yeah)
__repr__ goal is to be unambiguous
__str__ goal is to be readable
Container’s __str__ uses contained objects’ __repr__
Default implementation is useless
This is mostly a surprise because Python’s defaults tend to be fairly useful. However, in this case, having a default for ...
What specific productivity gains do Vim/Emacs provide over GUI text editors?
...o the editor can be extended in whatever ways you need. Tons of scripts already written and downloadable.
If you look closely enough, you'll find that even features that other editors also have, Vim often does better. All editors have syntax highlighting, but Vim has a syntax file for nearly eve...
How to write the Fibonacci Sequence?
... yield cur
for i in SubFib(10, 200):
print i
My hint is to learn to read what you need. Project Euler (google for it) will train you to do so :P
Good luck and have fun!
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How to declare a structure in a header that is to be used by multiple files in c?
...ame names), and none has drawbacks I know of, so using the same name makes reading simpler if you don't use C separate "namespaces" for structs and other symbols.
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