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How to drop columns by name in a data frame
... can use subset(), but it cannot really be used in the code (even the help file warns about it). Specifically, a problem to me is that if you want to directly use the drop feature of susbset() you need to write without quotes the expression corresponding to the column names:
subset( data, select = ...
Difference between MVC 5 Project and Web Api Project
...ication project type adds web specific things like default CSS, JavaScript files and other resources needed for a web site, which are not needed for an API.
MVC is used for creating web sites. In this case Controllers usually return a View (i.e. HTML response) to browser requests. Web APIs on the ...
“implements Runnable” vs “extends Thread” in Java
...lp to understand Extending v/s Implementing Thread.Extends binds two class files very closely and can cause some pretty hard to deal with code.
Both approaches do the same job but there have been some differences.
The most common difference is
When you extend Thread class, after that you can’t ex...
How do you 'redo' changes after 'undo' with Emacs?
...ut find this package to be very intuitive.
Here's the commentary from the file itself:
Emacs has a powerful undo system.
Unlike the standard undo/redo system
in most software, it allows you to
recover any past state of a buffer
(whereas the standard undo/redo system
can lose past stat...
How can I create a unique constraint on my column (SQL Server 2008 R2)?
...Type" box to "Unique Key".
Click "Close".
You see a little asterisk in the file window, this means changes are not yet saved.
Press Save or hit Ctrl+s. It should save, and your column should be unique.
Or set column as unique from the SQL Query window:
alter table location_key drop constraint pi...
How to map a composite key with JPA and Hibernate?
...lt;composite-id ...>...</composite-id> tag in the hbm.xml mapping file. So the PurchasedTest.hbm.xml will look like:
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dt...
Is Enabling Double Escaping Dangerous?
...ng particularly unwise with the uri decoded data (such as generating local filesystem URI's via string concatenation).
To disable the check do the following (from here): (see my comment below for what double escaping entails).
<system.webServer>
<security>
<requestFilter...
What is the default form HTTP method?
...lencoded"
accept %ContentTypes; #IMPLIED -- list of MIME types for file upload --
name CDATA #IMPLIED -- name of form for scripting --
onsubmit %Script; #IMPLIED -- the form was submitted --
onreset %Script; #IMPLIED -- the form was reset --
acce...
Bring element to front using CSS
... the html code of the element i wanted at the front at the end of the html file, because if one element has z-index and the other doesn't have z index it doesn't work.
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How to translate between Windows and IANA time zones?
...ion between Windows and IANA time zone identifiers is the windowsZones.xml file, distributed as part of the Unicode CLDR project. The latest dev version can be found here.
However, CLDR is released only twice annually. This, along with the periodic cadence of Windows updates, and the irregular upd...