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When do you use Git rebase instead of Git merge?
... (one will have branches, the other won't).
Merge will generally create an extra commit (e.g. node in the tree).
Merge and rebase will handle conflicts differently. Rebase will present conflicts one commit at a time where merge will present them all at once.
So the short answer is to pick rebase ...
What is the purpose of setting a key in data.table?
...due to data.table's internal radix sorting) and memory efficient (only one extra column of type double is allocated).
When is setkey() required?
For grouping operations, setkey() was never an absolute requirement. That is, we can perform a cold-by or adhoc-by.
## "cold" by
require(data.table)
DT...
How do you fix a bad merge, and replay your good commits onto a fixed merge?
... one way another, so anyone with old copies of the commits will have to do
extra work to re-sync their history with the new history.
Solution 1: Amending Commits
If you accidentally made a change (such as adding a file) in your previous
commit, and you don't want the history of that change to ex...
Git workflow and rebase vs merge questions
...hanges across files and have to resolve that multiple times.
With all the extra conflict resolution you need to do, it just increases the possibility that you will make a mistake. But mistakes are fine in git since you can undo, right? Except of course...
Reason #2: With rebase, there is no undo!
...
Algorithm to compare two images
...can be used as a search object. There are probably several ways you could extract properties/data from this region of interest and use them to search your data set.
If you have more than 2 regions of interest, you can measure the distances between them. Take this simplified example:
(source: pe...
Complete Working Sample of the Gmail Three-Fragment Animation Scenario?
...uickly and repeated then whole Layout drifted to right. It started showing extra space column on left. This behavior introduced because I wouldn't let the first animation (started by tap on middle ListView) complete and pressed the back button. I fixed it by replacing translationXBy with translation...
What Haskell representation is recommended for 2D, unboxed pixel arrays with millions of pixels?
...
Finally, my arrays are two-dimensional. I suppose I could deal with the extra indirection imposed by a representation as "array of arrays" (or vector of vectors), but I'd prefer an abstraction that has index-mapping support. Can anyone recommend anything from a standard library or from Hackage?
...
List of Big-O for PHP functions
...fred', $a) will return true while isset($['fred']) will return false. This extra step is non-trivial and will greatly increase execution time.
– orca
Jan 29 '13 at 19:16
...
How exactly does the callstack work?
...teed to cause a crash. This is offset, however, by the fact that a little extra code within each called method will save code at the places where the method is called. For that reason, most of the original Macintosh toolbox routines used the Pascal calling convention.
The C calling convention has...
SOAP vs REST (differences)
...s to fit inside that. You don't violate the protocol standards by creating extra methods, you leverage on the standard methods and create the actions with them on your media type. If done right, there's less coupling, and changes can be dealt with more gracefully. A client is supposed to enter a RES...