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Fastest way to replace NAs in a large data.table
...n the reader has to know that seq_along would be along the columns and not down the rows. seq_len(col(DT)) a tiny bit more explicit for that reason.
– Matt Dowle
Jan 11 '17 at 22:47
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Command substitution: backticks or dollar sign / paren enclosed? [duplicate]
...echo \` echo \\\` echo \\\\\\\` whoami \\\\\\\` \\\` \` ` (editing for markdown was equally nightmarish.)
– ceyko
Feb 25 '13 at 23:18
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Add Keypair to existing EC2 instance
...S Console access to an account with 2 instances running that I cannot shut down (in production). I would however like to gain SSH access to these instances, is it possible to create a new Keypair and apply it to the instances so I can SSH in? Obtaining the exisiting pem file for the keypair the inst...
Converting many 'if else' statements to a cleaner approach [duplicate]
... concerns about this approach? The use case provided in the question boils down to "execute one-and-only-one code path based on an input variable", which is (in my opinion) a pretty good definition of exactly what a switch is supposed to do.
– scubbo
Feb 3 '17 ...
Python subprocess.Popen “OSError: [Errno 12] Cannot allocate memory”
...vm settings to a plain CentOS 5.3 installation. Add a swap file. Ratchet down swappiness and see if you live any longer.
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How to list all functions in a Python module?
...ery useful in some cases where Python is installed in a constrained/locked-down/broken environment.
– Dan Lenski
Mar 18 '18 at 20:16
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Can we define implicit conversions of enums in c#?
... handle most fo the grunt work, which eases the above declaration of enums down to:
public sealed class AccountStatus : RichEnum<byte, AccountStatus>
{
public static readonly AccountStatus Open = new AccountStatus(1);
public static readonly AccountStatus Closed = new AccountStatus(2);...
HTML5 best practices; section/header/aside/article elements
...ocument, HTML5 allows us to also have footer within sections.
Source: https://clzd.me/html5-section-aside-header-nav-footer-elements-not-as-obvious-as-they-sound/
Additionally, here's a description on article, not found in the source above:
article – Used for element that specifies inde...
When to use AtomicReference in Java?
...tween multiple threads. That is a super dense statement so I will break it down a bit.
First, an immutable object is an object that is effectively not changed after construction. Frequently an immutable object's methods return new instances of that same class. Some examples include the wrapper cl...
List the queries running on SQL Server
... all of the in and out traffic to the server. Profiler also let you narrow down exactly what you are watching for.
For SQL Server 2008:
START - All Programs - Microsoft SQL Server 2008 - Performance Tools - SQL Server Profiler
Keep in mind that the profiler is truly a logging and watching app. I...