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How to find the length of a string in R
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> stri_length(c("ala ma kota","ABC",NA))
[1] 11 3 NA
Why? Because it is the FASTEST among presented solutions :)
require(microbenchmark)
require(stringi)
require(stringr)
x <- c(letters,NA,paste(sample(letters,2000,TRUE),collapse=" "))
microbenchmark(nchar(x),str_length(x),stri_le...
“Width equals height” constraint in Interface Builder
I can't find a way to create a 'square' constraint, meaning 'width equals height' in Interface Builder. I guess it's possible to add such constraint programmatically. Is there something I can do in IB? Maybe I just don't see it? It seems trivial, yet I can't find it.
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Excluding directories in os.walk
...dirs if d not in exclude]
From help(os.walk):
When topdown is true, the caller can modify the dirnames list in-place
(e.g., via del or slice assignment), and walk will only recurse into
the subdirectories whose names remain in dirnames; this can be used to
prune the search...
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Difference between make and build in Android Studio
...ll the source files in the specified scope are compiled. The scope in this case may be a file, a package, etc.
Make Project All the source files in the entire project that have been modified since the last compilation are compiled. Dependent source files, if appropriate, are also compiled. Addi...
How to change owner of PostgreSql database?
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For an alternative to REASSIGN OWNED (typically because your owner is postgres), see the snippets in stackoverflow.com/a/2686185/1839209.
– Michael Herrmann
Apr 15 at 7:46
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Running a cron job at 2:30 AM everyday
...rontab
"/tmp/crontab.tNt1NL/crontab":7: bad minute
errors in crontab file, can't install.
Do you want to retry the same edit? (y/n)
If you have further problems with crontab not running you can check Debugging crontab or Why is crontab not executing my PHP script?.
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Invoking a static method using reflection
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// String.class here is the parameter type, that might not be the case with you
Method method = clazz.getMethod("methodName", String.class);
Object o = method.invoke(null, "whatever");
In case the method is private use getDeclaredMethod() instead of getMethod(). And call setAccessible(tru...
How to find an element by matching exact text of the element in Capybara
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Just use Capybara's exact option:
Capybara.exact = true
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How do I merge a git tag onto a branch
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@learner a Tag identifies a specific commit. You can't merge into a specific commit so you'd need to move the tag to the commit you want. This would address the how on that: stackoverflow.com/questions/8044583/…
– Josiah
Jun 16 at 15...
Why can I type alias functions and use them without casting?
...this is a misunderstanding that I had about how Go dealt with types, which can be resolved by reading the relevant part of the spec:
http://golang.org/ref/spec#Type_identity
The relevant distinction that I was unaware of was that of named and unnamed types.
Named types are types with a name, such...