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What is the purpose of setting a key in data.table?
...st and efficient sort, filter, and join operations. These are probably the best reasons to use data tables instead of data frames (the syntax for using data tables is also much more user friendly, but that has nothing to do with keys).
If you don't understand indexes, consider this: a phone book is...
git merge: apply changes to code that moved to a different file
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Well, it's the best answer so far. I couldn't figure out how to make git format-patch work for a commit. If I do git format-patch SHA1, it generates a whole bunch of patch files for the whole history. But I guess git show SHA1 > di...
What is the Sign Off feature in Git for?
...at you have created the patch in question, or that you certify that to the best of your knowledge, it was created under an appropriate open-source license, or that it has been provided to you by someone else under those terms. This can help establish a chain of people who take responsibility for the...
How do I base64 encode (decode) in C?
...OP is already using OpenSSL for some other reason, so this is probably the best way to go about it.
– joshk0
Apr 30 '09 at 18:19
add a comment
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Git workflow and rebase vs merge questions
...commit now contains the bad merge, and you can't just redo the rebase*. At best, you have to go back and amend each of the affected commits. Not fun.
After a rebase, it's impossible to determine what was originally part of the commits and what was introduced as a result of bad conflict resolution....
How to modify a global variable within a function in bash?
...own difficult to solve problem.
There are several ways on how to solve it best, this depends on your needs.
Here is a step by step guide on how to do it.
Passing back variables into the parental shell
There is a way to pass back variables to a parental shell. However this is a dangerous path, b...
Why are Subjects not recommended in .NET Reactive Extensions?
...ut you've not given enough detail in your original post to indicate how to best translate this to IObservable<T> as no information about how you're currently signaling with that information is given.
– casperOne
Jan 22 '13 at 15:34
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Is there a way to detect if an image is blurry?
...n focusMeasure;
}
No guarantees on whether or not these measures are the best choice for your problem, but if you track down the papers associated with these measures, they may give you more insight. Hope you find the code useful! I know I did.
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JavaScript closures vs. anonymous functions
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i think this is the best answer, explaining closures generally and simply and then went into the specific use case. thanks!
– tim peterson
Mar 18 '13 at 12:49
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Grouping functions (tapply, by, aggregate) and the *apply family
...g this answer! Obviously, I'm sure many people use it, but YMMV. rapply is best illustrated with a user-defined function to apply:
# Append ! to string, otherwise increment
myFun <- function(x){
if(is.character(x)){
return(paste(x,"!",sep=""))
}
else{
return(x + 1)
}
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