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How to center a button within a div?
...style="display: block; margin: 0 auto;">
</div>
The first one will center align everything inside the div. The other one will center align just the button.
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What does .SD stand for in data.table in R
...1 col: y
and operates on them in turn.
While it is operating on either one, it lets you refer to the current sub-data.table by using the nick-name/handle/symbol .SD. That's very handy, as you can access and operate on the columns just as if you were sitting at the command line working with a sin...
How do you effectively model inheritance in a database?
...performance gains in some cases this is entirely due to an incomplete (or nonexistent) separation between the logical and physical structure of data in the DBMS. Unfortunately the majority of commercial DBMS suffer from this problem. @PerformanceDBA is correct. Undernormalization is a judgement erro...
How can I ensure that a division of integers is always rounded up?
...swer right the first time - is to approach the problem carefully, solve it one step at a time, and use good engineering principles in doing so.
Start by reading the specification for what you're trying to replace. The specification for integer division clearly states:
The division rounds the resu...
“PKIX path building failed” and “unable to find valid certification path to requested target”
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For anyone getting an "access denied" error, make sure you're running command prompt as an administrator.
– Walker Christie
Apr 24 '18 at 15:49
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Histogram using gnuplot?
... I think @ChrisW's answer below brings an important point to notice for anyone who wants to make a Histogram in Gnuplot.
– Abhinav
Oct 26 '13 at 2:49
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Easiest way to copy a single file from host to Vagrant guest?
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Instead of using a shell provisioner to copy the file, you can also use a Vagrant file provisioner.
Provisioner name: "file"
The file provisioner allows you to upload a file from the host machine to the guest machine.
Vagrant.configure("2") do |config|
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Can regular expressions be used to match nested patterns? [duplicate]
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I agree. However,one problem with the (?>...) atomic group syntax (under PHP 5.2) is that the ?> portion is interpreted as: "end-of-script"! Here is how I would write it: /\((?:[^()]++|(?R))*+\)/. This is a bit more efficient for both m...
Set padding for UITextField with UITextBorderStyleNone
... This works fine except for the fact that I have to use UITextBorderStyleNone to make it look pretty. This forces the text to stick to the left without any padding.
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Xcode 6 Bug: Unknown class in Interface Builder file
...ng the question. I figured I'd answer my question and leave it here for anyone else who may face this issue when using Xcode 6 beta 4.
To resolve this issue, you need to select each of your custom class objects in Storyboard (this includes any custom views, even the custom view controllers themselv...