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Repeat each row of data.frame the number of times specified in a column
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neilfwsneilfws
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C++ Const Usage Explanation
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Read this: https://isocpp.org/wiki/faq/const-correctness
The final const means that the function Method3 does not modify the non mutable members of its class.
const int* const means a constant pointer to a constant int: i.e. a pointer that cannot be chang...
Does anyone still use [goto] in C# and if so why? [closed]
I was wondering whether anyone still uses the "goto" keyword syntax in C# and what possible reasons there are for doing so.
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Combating AngularJS executing controller twice
... understand AngularJS runs through some code twice, sometimes even more, like $watch events, constantly checking model states etc.
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MySQL Great Circle Distance (Haversine formula)
I've got a working PHP script that gets Longitude and Latitude values and then inputs them into a MySQL query. I'd like to make it solely MySQL. Here's my current PHP Code:
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How do I hide an element on a click event anywhere outside of the element?
I would like to know whether this is the correct way of hiding visible elements when clicked anywhere on the page.
20 Answ...
Changing the current working directory in Java?
How can I change the current working directory from within a Java program? Everything I've been able to find about the issue claims that you simply can't do it, but I can't believe that that's really the case.
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How to do exponentiation in clojure?
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classic recursion (watch this, it blows stack)
(defn exp [x n]
(if (zero? n) 1
(* x (exp x (dec n)))))
tail recursion
(defn exp [x n]
(loop [acc 1 n n]
(if (zero? n) acc
(recur (* x acc) (dec n)))))
functional
(defn exp [x n]
(redu...
What is the difference between & and && in Java?
...ent? It never will be faster than && and ||. Why do we want to check second condition if we already can have answer? Can you provide and realistic example, please?
– Michu93
Jul 13 '17 at 14:24
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How to get the start time of a long-running Linux process?
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You can specify a formatter and use lstart, like this command:
ps -eo pid,lstart,cmd
The above command will output all processes, with formatters to get PID, command run, and date+time started.
Example (from Debian/Jessie command line)
$ ps -eo pid,lstart,cmd
PID ...