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How to join (merge) data frames (inner, outer, left, right)
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By using the merge function and its optional parameters:
Inner join: merge(df1, df2) will work for these examples because R automatically joins the frames by common variable names, but you would most likely want to specify merge(df1, df2, by = "Custome...
PCH File in Xcode 6
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Add the pch file which is under Others in File-New...and don't forget to add it to your LLVM6.0 - Language section of Build Settings as Project/whateveryounamedyourpchfile.pch
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Xcode 4: How do you view the console?
...ight in left sidebar). Then choose your Debug/Run session in left sidebar, and you will have console in editor area.
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Function overloading in Javascript - Best practices
...ent length or the types; checking the types will just make your code slow and you have the fun of Arrays, nulls, Objects, etc.
What most developers do is tack on an object as the last argument to their methods. This object can hold anything.
function foo(a, b, opts) {
// ...
if (opts['test'...
Changing Java Date one hour back
...ary of the fact that there is Calendar.HOUR which works with 12 hour clock and Calendar.HOUR_OF_DAY for 24 hour clock: chintat.blogspot.ca/2006/05/…
– Wolf
Apr 27 '15 at 17:24
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Google App Engine: Is it possible to do a Gql LIKE query?
... words, every query must use an index. This is why you can only do =, > and < queries. (In fact you can also do != but the API does this using a a combination of > and < queries.) This is also why the development environment monitors all the queries you do and automatically adds any mis...
Is there a (repeat-last-command) in Emacs?
Frequently, I've dug into apropos and docs looking for something like the following only to give up to get back to the task at hand:
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Can you break from a Groovy “each” closure?
...ndition.
Alternatively, you could use a "find" closure instead of an each and return true when you would have done a break.
This example will abort before processing the whole list:
def a = [1, 2, 3, 4, 5, 6, 7]
a.find {
if (it > 5) return true // break
println it // do the stuff th...
gulp.run is deprecated. How do I compose tasks?
...ugh you still can) to run tasks. You can give watch an array of task names and it will do this for you.
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Git diff between current branch and master but not including unmerged master commits
...How can I see what branch another branch was forked from?
Note that .. and ... syntax does not have the same semantics as in other Git tools. It differs from the meaning specified in man gitrevisions.
Quoting man git-diff:
git diff [--options] <commit> <commit> [--] [<path...