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Is there a short cut for going back to the beginning of a file by vi editor?
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Well, you have [[ and ]] to go to the start and end of file. This works in vi.
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OO Design in Rails: Where to put stuff
...xcise everything from their controllers and throw it into the model, which starts to become a new trash can for application logic.
Skinny controllers are, in fact, a good idea, but the corollary--putting everything in the model, isn't really the best plan.
In Ruby, you have a couple of good option...
Where are the PostgreSQL logs on macOS?
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This doesn't work if your database failed to start and you don't know where the log files are yet.
– Iain Samuel McLean Elder
Sep 26 '13 at 15:42
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Benchmarking (python vs. c++ using BLAS) and (numpy)
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Your CalcTime function in C++ seems to have a sign error. ... + ((double)start.tv_usec)) should be instead ... - ((double)start.tv_usec)). Perhaps your benchmark also has other bugs, e.g., comparing between different BLAS libraries, or different BLAS settings such as number of threads, or between ...
How to import multiple .csv files at once?
... string that matches headers and only headers (ie suppose header lines all start with "Age"), you'd do:
cat *.csv | grep -v ^Age > all.csv
I think in Windows you could do this with COPY and SEARCH (or FIND or something) from the DOS command box, but why not install cygwin and get the power of ...
What is the equivalent of bigint in C#?
... my bigint primary key, and I get a cast error using long - that was why I started this search. The correct answer, at least in my case, is that the type returned by that select is NUMERIC which equates to a decimal type. Using a long will cause a cast exception.
This is one reason to check your ans...
Why is “while ( !feof (file) )” always wrong?
...interactive devices -- sometimes forcing the input of the next line before starting the handling of the previous one), you would have to be able to handle a failure.
So the correct idiom in C is to loop with the IO operation success as loop condition, and then test the cause of the failure. For in...
Column order manipulation using col-lg-push and col-lg-pull in Twitter Bootstrap 3
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col-vp-push-x = push the column to the right by x number of columns, starting from where the column would normally render -> position: relative, on a vp or larger view-port.
col-vp-pull-x = pull the column to the left by x number of columns, starting from where the column would normally ren...
Good open source django project for learning [closed]
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django-basic-apps is also a very good start to learn django and reusable apps. These apps are simple enough and code is well written.
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Using @property versus getters and setters
...hey're there for.
The reason is that all attributes are public in Python. Starting names with an underscore or two is just a warning that the given attribute is an implementation detail that may not stay the same in future versions of the code. It doesn't prevent you from actually getting or settin...