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How to find common elements from multiple vectors?
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It is worth noting that intersect is for set operations. If you have elements recurring in the vectors, you will lose this info because the vectors are turned into sets prior to intersect. E.g. intersect(c(1,1,2,3), c(1,1,3,4)) would result in c(1,3), and you might ...
Transfer-Encoding: gzip vs. Content-Encoding: gzip
...y client who can do gzip via Transfer-Encoding will let the server know by setting TE: gzip. And then your server should go the Transfer-Encoding route. If the client only says Accept-Encoding: gzip, you have to do it the Content-Encoding way. If the client specifies neither in its request, the serv...
How to get a pixel's x,y coordinate color from an image?
... 0, img.width, img.height);
After that, when a user clicks, use event.offsetX and event.offsetY to get the position. This can then be used to acquire the pixel:
var pixelData = canvas.getContext('2d').getImageData(event.offsetX, event.offsetY, 1, 1).data;
Because you are only grabbing one pixe...
How to pull remote branch from somebody else's repo
.../repo.git
git fetch coworker
git checkout --track coworker/foo
This will setup a local branch foo, tracking the remote branch coworker/foo. So when your co-worker has made some changes, you can easily pull them:
git checkout foo
git pull
Response to comments:
Cool :) And if I'd like to ma...
How to exclude certain directories/files from git grep search
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# The basic setup of this script is from here:
# https://stackoverflow.com/a/14226610/42580
# But there is issues with giving extra path information to the script ...
Indent multiple lines quickly in vi
...s aligns the pasted block with the surrounding text.
Also, the shiftwidth setting allows you to control how many spaces to indent.
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What does gcc's ffast-math actually do?
...(ideally) but not exactly the same in floating point.
Second, it disables setting errno after single-instruction math functions, which means avoiding a write to a thread-local variable (this can make a 100% difference for those functions on some architectures).
Third, it makes the assumption that ...
Windows batch: formatted date into variable
... /f "skip=1" %%x in ('wmic os get localdatetime') do if not defined MyDate set MyDate=%%x
Then you can extract the individual parts using substrings:
set today=%MyDate:~0,4%-%MyDate:~4,2%-%MyDate:~6,2%
Another way, where you get variables that contain the individual parts, would be:
for /f %%x...
C++11 introduced a standardized memory model. What does it mean? And how is it going to affect C++ p
...r and may not be known beforehand. The characteristic feature of SC is the set of horizontal slices in the address-space-time diagram representing planes of simultaneity (i.e., memory images). On a given plane, all of its events (or memory values) are simultaneous. There is a notion of Absolute Time...
SVN:externals equivalent in Git?
... a separate sub-directory within your repo. This has a detailed process to set up and then is very easy for other users, because it is automatically included when the repository is checked out or cloned. This can be a convenient way to include a dependency in your project.
It is easy to pull changes...