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Update R using RStudio
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You install a new version of R from the official website.
RStudio should automatically start with the new version when you relaunch it.
In case you need to do it manually, in RStudio, go to :Tools -> options -> General.
Check @micstr's answer for a more detailed walkth...
Loop through all the files with a specific extension
I want to loop through each file in the current folder and check if it matches a specific extension. The code above doesn't work, do you know why?
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Embedding unmanaged dll into a managed C# dll
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You can embed the unmanaged DLL as a resource if you extract it yourself to a temporary directory during initialization, and load it explicitly with LoadLibrary before using P/Invoke. I have used this technique and it works well. You may prefer to just link it to the assembly as a sepa...
What is the difference between `let` and `var` in swift?
...Answer cannot be changed afterwards. This is why anything weak can't be written using let. They need to change during runtime and you must be using var instead.
The var defines an ordinary variable.
What is interesting:
The value of a constant doesn’t need to be known at compile time, but y...
Core pool size vs maximum pool size in ThreadPoolExecutor
...d maximum pool size when we talk in terms of ThreadPoolExecutor ?
Can it be explained with the help of an example?
10...
ModelState.IsValid == false, why?
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About "can it be that 0 errors and IsValid == false": here's MVC source code from https://github.com/Microsoft/referencesource/blob/master/System.Web/ModelBinding/ModelStateDictionary.cs#L37-L41
public bool IsValid {
get {
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Convert list to array in Java [duplicate]
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Either:
Foo[] array = list.toArray(new Foo[0]);
or:
Foo[] array = new Foo[list.size()];
list.toArray(array); // fill the array
Note that this works only for arrays of reference types. For arrays of primitive types, use...
How to get the URL without any parameters in JavaScript?
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This is possible, but you'll have to build it manually from the location object:
location.protocol + '//' + location.host + location.pathname
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How to detect IE11?
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IE11 no longer reports as MSIE, according to this list of changes it's intentional to avoid mis-detection.
What you can do if you really want to know it's IE is to detect the Trident/ string in the user agent if navigator.appName returns Netscape, something like (the untested);
functi...
Environment variables in Mac OS X
... example, if you want to mirror your current path in launchd after setting it up in .bashrc or wherever:
PATH=whatever:you:want
launchctl setenv PATH $PATH
Environment variables are not automatically updated in running applications. You will need to relaunch applications to get the updated enviro...