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Understanding exactly when a data.table is a reference to (vs a copy of) another data.table
...00000000040ED948]:
# tracemem[00000000040ED948 -> 00000000040ED830]: .Call copy $<-.data.table $<-
.Internal(inspect(DT))
# @0000000003B7E2A0 19 VECSXP g0c7 [OBJ,NAM(2),TR,ATT] (len=2, tl=100)
# @00000000040C2288 14 REALSXP g0c2 [NAM(2)] (len=2, tl=0) 1,2
# @00000000040C2250 14 REALS...
How do I create a SQL table under a different schema?
This is from SQL Server 2008, ssms
6 Answers
6
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Delete empty lines using sed
... spaces or tabs in your "empty" line. Use POSIX classes with sed to remove all lines containing only whitespace:
sed '/^[[:space:]]*$/d'
A shorter version that uses ERE, for example with gnu sed:
sed -r '/^\s*$/d'
(Note that sed does NOT support PCRE.)
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Could not load file or assembly 'System.Web.Mvc'
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Quick & Simple Solution: I faced this problem with Microsoft.AspNet.Mvc -Version 5.2.3 and after going through all these threads I found a simplest solution.
Just follow steps:
Open NuGet Package Manager in Visual studio for...
Make an HTTP request with android
...nswer, is there a way to make an simple HTTP request? I want to request an PHP page / script on one of my website but I don't want to show the webpage.
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Git 工具 - 子模块(submodule)：一个仓库包含另一个仓库 - 开源 & Github -...
...with 'origin/master'.
Changes to be committed:
(use "git reset HEAD <file>..." to unstage)
new file: .gitmodules
new file: DbConnector
首先应当注意到新的 .gitmodules 文件。 该配置文件保存了项目 URL 与已经拉取的本地目录之间的映射：
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How do I get the object if it exists, or None if it does not exist?
... python is to wrap it in a try catch:
try:
go = SomeModel.objects.get(foo='bar')
except SomeModel.DoesNotExist:
go = None
What I did do, is to subclass models.Manager, create a safe_get like the code above and use that manager for my models. That way you can write: SomeModel.objects.safe_...
When should I use uuid.uuid1() vs. uuid.uuid4() in python?
...produce unique UUIDs if you produce several per second on the same node. Example: [uuid.uuid1() for i in range(2)]. Unless of course something strange is going on that I'm missing.
– Michael Mior
Nov 16 '13 at 4:14
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Java logical operator short-circuiting
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The &amp;&amp; and || operators "short-circuit", meaning they don't evaluate the right-hand side if it isn't necessary.
The &amp; and | operators, when used as logical operators, always evaluate both sides.
There is only one cas...
For a boolean field, what is the naming convention for its getter/setter?
...r: http://martinfowler.com/bliki/FlagArgument.html
However, I come from a PHP background and see this trend being adopted more and more. Not sure how much this lives with Java development.
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