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Reshaping data.frame from wide to long format
...s melt/cast. Here is a solution with reshape, assuming your data frame is called d:
reshape(d,
direction = "long",
varying = list(names(d)[3:7]),
v.names = "Value",
idvar = c("Code", "Country"),
timevar = "Year",
times = 1950:1954)
...
How do I change the IntelliJ IDEA default JDK?
...I want IntelliJ IDEA to reflect changes of JAVA_HOME sys variable automatically.
– Ivan_Bereziuk
Nov 16 '17 at 10:48
1
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Can you define aliases for imported modules in Python?
...
import a_ridiculously_long_module_name as short_name
also works for
import module.submodule.subsubmodule as short_name
share
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How to track child process using strace?
...ously search for the parent thread, then the grandparent thread, and so on all the way to the root process.
4 Answers
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Extension methods cannot be dynamically dispatched
...el IEnumerable<dynamic>
@PartialExtensions.Partial(Html, "~/link/to/_partialView.cshtml", Model)
Wrapping it in a class.
public class DynamicQueryResult
{
public dynamic QueryResults {get; set;}
}
Then in your MVC View:
@model Namespace.DynamicQueryResult
@Html.Partial("~/link/to/_...
How do you get the index of the current iteration of a foreach loop?
...or iterating over collections that implement IEnumerable. It does this by calling GetEnumerator on the collection, which will return an Enumerator.
This Enumerator has a method and a property:
MoveNext()
Current
Current returns the object that Enumerator is currently on, MoveNext updates Current t...
How to style SVG with external CSS?
... want them to have different fill colors, this won't work, but if you want all your paths to be the same, this should work.
In your html file, you want something like this:
<style>
.fill-red { fill: red; }
.fill-blue { fill: blue; }
</style>
<a href="//www.example.com/">
&...
Get the IP address of the machine
...hould be the same below.
I've done a quick example below which will print all of the machine's IPv4 address, (you should also check the getifaddrs was successful ie returns 0).
I've updated it show IPv6 addresses too.
#include <stdio.h>
#include <sys/types.h>
#include <ifaddr...
Using querySelectorAll to retrieve direct children
...
Good question. At the time it was asked, a universally-implemented way to do "combinator rooted queries" (as John Resig called them) did not exist.
Now the :scope pseudo-class has been introduced. It is not supported on [pre-Chrominum] versions of Edge or IE, but has been s...
How to split a large text file into smaller files with equal number of lines?
...a large (by number of lines) plain text file that I'd like to split into smaller files, also by number of lines. So if my file has around 2M lines, I'd like to split it up into 10 files that contain 200k lines, or 100 files that contain 20k lines (plus one file with the remainder; being evenly divi...