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How to permanently export a variable in Linux?
...an add it to your shell configuration file, e.g. $HOME/.bashrc or more globally in /etc/environment.
After adding these lines the changes won't reflect instantly in GUI based system's you have to exit the terminal or create a new one and in server logout the session and login to reflect these change...
How to define optional methods in Swift protocol?
...an take advantage of powerful generics system.
You can always be sure that all requirements are met when encountering types that conform to such protocol. It's always either concrete implementation or default one. This is how "interfaces" or "contracts" behave in other languages.
Disadvantages
F...
How can I open the interactive matplotlib window in IPython notebook?
...switch after having started with pylab=inline or pylab=qt, you get: This call to matplotlib.use() has no effect because the the backend has already been chosen; matplotlib.use() must be called before pylab, matplotlib.pyplot, or matplotlib.backends is imported for the first time.
...
What do people think of the fossil DVCS? [closed]
... well and comparing makes it easier for me to get the idea across.
I'm totally in love with this SCM, so it's mostly points on the pluss side.
What I like about Fossil:
1) We have a bunch of machines (win/mac/a number of linux distros), and the single-executable installation is just as beautiful ...
What is “vectorization”?
...vec" instructions, and even some ARM chips have a vector instruction set, called NEON.
"Vectorization" (simplified) is the process of rewriting a loop so that instead of processing a single element of an array N times, it processes (say) 4 elements of the array simultaneously N/4 times.
(I chose 4...
How do you see the entire command history in interactive Python?
...s there an option like the --history option in bash shell, which shows you all the commands you've entered so far?
10 Answe...
Does Python SciPy need BLAS?
...
The SciPy webpage used to provide build and installation instructions, but the instructions there now rely on OS binary distributions. To build SciPy (and NumPy) on operating systems without precompiled packages of the required libraries, you must build and then statically...
PostgreSQL: How to make “case-insensitive” query
...a. But there are two problems with that.
It works in English, but not in all languages. (Maybe not even in
most languages.) Not every lowercase letter has a corresponding
uppercase letter; not every uppercase letter has a corresponding
lowercase letter.
Using functions like lower() and upper() wil...
Git: “please tell me who you are” error
...
I spend on it lots hours when i call php script to init and commit git.
And i Found the work flow should Be:
1.git init
2.git config user.name "someone"
3.git config user.email "someone@someplace.com"
4.git add *
5.git commit -m "some init msg"
If you swa...
Why is Github asking for username/password when following the instructions on screen and pushing a n
...after reading stackoverflow.com/a/10126412/29347, I don't think github normally gives me a repo remote as HTTPS which caused some confusion.
– Kit Sunde
Jun 6 '12 at 6:41
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