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How does BLAS get such extreme performance?
...k The Science of Programming Matrix Computations by Robert A. van de Geijn and Enrique S. Quintana-Ortí. They provide a free download version.
BLAS is divided into three levels:
Level 1 defines a set of linear algebra functions that operate on vectors only. These functions benefit from vectoriza...
What is the Invariant Culture?
...ture, then parsing will fail. However you can use the invariant culture to convert a number to a string and later parse it back from any computer with any culture set.
// Use some non-invariant culture.
CultureInfo nonInvariantCulture = new CultureInfo("en-US");
Thread.CurrentThread.CurrentCulture ...
How to use sessions in an ASP.NET MVC 4 application?
I am new to ASP.NET MVC. I have used PHP before and it was easy to create a session and select user records based on the current session variables.
...
python: Change the scripts working directory to the script's own directory
...dirname(abspath)
os.chdir(dname)
This takes the filename of your script, converts it to an absolute path, then extracts the directory of that path, then changes into that directory.
share
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improv...
How to get error message when ifstream open fails
... another system call triggers an error between the execution of the f.open and use of errno.
On system with POSIX standard:
errno is thread-local; setting it in one thread does not affect its
value in any other thread.
Edit (thanks to Arne Mertz and other people in the comments):
e.wha...
Is there a setting on Google Analytics to suppress use of cookies for users who have not yet given c
...et('clientId'));
});
ga('send', 'pageview');
Also check out this code at Convert Google Analytics cookies to Local/Session Storage
This script will not set any cookies, but still track via google analytics. This will actually have the same effect on privacy as using cookies, because google still ...
What is the proper way to URL encode Unicode characters?
...present characters from the unreserved set without translation, and should convert all other characters to bytes according to UTF-8, and then percent-encode those values. This requirement was introduced in January 2005 with the publication of RFC 3986. URI schemes introduced before this date are not...
Async image loading from url inside a UITableView cell - image changes to wrong image while scrollin
...ta = data
if error == nil {
// Convert the downloaded data in to a UIImage object
let image = UIImage(data: data!)
// Store the image in to our cache
self.previewImg[indexPath.row] = d...
What does “default” mean after a class' function declaration?
...e that function automatically.
With the introduction of move constructors and move assignment operators, the rules for when automatic versions of constructors, destructors and assignment operators are generated has become quite complex. Using = default and = delete makes things easier as you don't ...
Change key pair for ec2 instance
... you will want to edit the authorized_keys file on the instance itself and convert to your new ssh public key.
The authorized_keys file is under the .ssh subdirectory under the home directory of the user you are logging in as. Depending on the AMI you are running, it might be in one of:
/home/ec2...