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Counting the number of elements with the values of x in a vector
... x creates a logical vector which is TRUE at every location that x occurs, and when suming, the logical vector is coerced to numeric which converts TRUE to 1 and FALSE to 0.
However, note that for floating point numbers it's better to use something like: sum(abs(numbers - x) < 1e-6).
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class
...d
String.value_of 42 # => "42"
This can also be written as a shorthand:
class String
def self.value_of obj
obj.to_s
end
end
Or even shorter:
def String.value_of obj
obj.to_s
end
When inside a function definition, self refers to the object the function is being called with. ...
Add Bootstrap Glyphicon to Input Box
...="form-control" />
</div>
You can use the following CSS to left and right align glyphs:
/* enable absolute positioning */
.inner-addon {
position: relative;
}
/* style icon */
.inner-addon .glyphicon {
position: absolute;
padding: 10px;
pointer-events: none;
}
/* align icon...
Android: How can I pass parameters to AsyncTask's onPreExecute()?
...xactly what I did now. I still need a member variable but in the AsyncTask and not the outer class if that's what you mean. This is what I did: private class MyAsyncTask extends AsyncTask<Void, Void, Void> { private boolean showLoading; public MyAsyncTask(boolean showLoading) { ...
How do I assert equality on two classes without an equals method?
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@PiotrAleksanderChmielowski, sorry, when working with Spring+JPA+Entities, the Entity object may have an id (representing the id field of the database table), so when it is empty (a new object not yet stored on the DB), refEq fails to c...
What is the purpose of “!” and “?” at the end of method names?
Sometimes I see methods in Ruby that have "?" and "!" at the end of them, e.g:
5 Answers
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Can you get the column names from a SqlDataReader?
...nnames in lowercase. Column names in table are all uppercase like OBJECTID and reader is returning lowercase like objectid
– Muneem Habib
Nov 17 '15 at 11:30
2
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Converting Mercurial folder to a Git repository
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If you are on Windows machine use the Git bash and run hg-fast-export.sh
– Augustas
Dec 7 '17 at 13:45
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Python memoising/deferred lookup property decorator
...f the instance, but they're a real bottleneck to calculate that first time and only really accessed for special cases. Hence they can also be cached after they've been retrieved from the database (this therefore fits the definition of memoisation where the input is simply "no input").
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How to ignore certain files in Git
...racked before (by git add). Run git reset name_of_file to unstage the file and keep it. In case you want to also remove the given file from the repository (after pushing), use git rm --cached name_of_file.
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