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What does .SD stand for in data.table in R
...elp you see what .SD is:
DT[ , .SD[ , paste(x, v, sep="", collapse="_")], by=y]
# y V1
# 1: 1 a1_b3_c5
# 2: 3 a2_b4_c6
Basically, the by=y statement breaks the original data.table into these two sub-data.tables
DT[ , print(.SD), by=y]
# <1st sub-data.table, called '.SD' while it's be...
How to use ELMAH to manually log errors
... Control Services with a SignInResponseMessage. Elmah.ErrorLog.GetDefault did work in that scenario
– Adam
Feb 27 '13 at 1:17
...
How to use LINQ to select object with minimum or maximum property value
...implement for yourself. Here are the guts of it:
public static TSource MinBy<TSource, TKey>(this IEnumerable<TSource> source,
Func<TSource, TKey> selector)
{
return source.MinBy(selector, null);
}
public static TSource MinBy<TSource, TKey>(this IEnumerable<TSourc...
Get JSF managed bean by name in any Servlet related class
...vlet (for AJAX/JSON) in which I would like to reference my @ManagedBeans by name. I'm hoping to map:
6 Answers
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How do I add a class to a given element?
... of your new class to the className property of the element. First, put an id on the element so you can easily get a reference.
<div id="div1" class="someclass">
<img ... id="image1" name="image1" />
</div>
Then
var d = document.getElementById("div1");
d.className += " oth...
Where to learn about VS debugger 'magic names'
...ypes, methods, fields, and local variables, that deserve 'special' display by the debugger. For instance, local variables beginning with 'CS$' are not displayed to the user. There are other special naming conventions for closure types of anonymous methods, backing fields of automatic properties, and...
How to “fadeOut” & “remove” a div in jQuery?
I'm trying to give fadeout effect to a div & delete that div(id = "notification"), when an image is clicked.
7 Answers
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How connect Postgres to localhost server using pgAdmin on Ubuntu?
....x/main/pg_hba.conf
and change this line:
Database administrative login by Unix domain socket
local all postgres md5
to
Database administrative login by Unix domain socket
local all postgres trust
Rest...
Could not instantiate class named MKMapView
...
I ran into this too, but I was able to get past it by following the instructions of step 2 in your link (thanks, by the way):
Add the MapKit framework to the project. (Control + Click Frameworks
folder -> Add -> Existing Frameworks)
I just searched for Map...
How to make URL/Phone-clickable UILabel?
... Safari webpage. I also want the user to be able to phone the numbers only by clicking on them ?
11 Answers
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