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Is it possible to have a multi-line comments in R? [duplicate]
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You can, if you want, use standalone strings for multi-line comments — I've always thought that prettier than if (FALSE) { } blocks. The string will get evaluated and then discarded, so as long as it's not the last line in a function nothing will happen.
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Measuring code execution time
...ilable nuget.org/packages/LogExec). This does the exact same things that @soner-gonul mentioned - but, the usage is clutter free and hides all the boilerplate code. Very helpful when you want to use it very frequently. It also uses Common.Logging so that you can integrate with your preferred logging...
Calling class staticmethod within the class body?
...al function, I had no idea of the specifics. In the spirit of teaching someone to fish rather than giving them a fish, this is what I did to investigate and find that out (a C&P from my Python session):
>>> class Foo(object):
... @staticmethod
... def foo():
... return ...
How to escape braces (curly brackets) in a format string in .NET
...fying the FormatProvider twice, with the risk that you'd specify different ones, or miss one.
– ClickRick
Apr 20 '15 at 9:02
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mongo group query how to keep fields
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Just a quick update if one faces the same issue with documents with numerous fields.
One can use the power of combining the $replaceRoot pipeline stage and the $mergeObjects pipeline operator.
db.users.aggregate([
{
$group: {
_id: '$n...
How to append rows to an R data frame
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Update
Not knowing what you are trying to do, I'll share one more suggestion: Preallocate vectors of the type you want for each column, insert values into those vectors, and then, at the end, create your data.frame.
Continuing with Julian's f3 (a preallocated data.frame) as the fa...
Keep-alive header clarification
I was asked to build a site , and one of the co-developer told me That I would need to include the keep-alive header.
1 An...
What does the arrow operator, '->', do in Java?
...e are a couple of online tutorials to get the hang of it, here's a link to one. Basically, the -> separates the parameters (left-side) from the implementation (right side).
The general syntax for using lambda expressions is
(Parameters) -> { Body } where the -> separates parameters and lamb...
Disabled input text color
...y in Firefox and WebKit-based browsers (I checked in Safari, Chrome and iPhone).
10 Answers
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How to get random value out of an array?
...nction to select a random key from your array like below.
$array = array("one", "two", "three", "four", "five", "six");
echo $array[array_rand($array, 1)];
or you could use the rand and count functions to select a random index.
$array = array("one", "two", "three", "four", "five", "six");
echo...