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Check for installed packages before running install.packages() [duplicate]
...s on different computers. One of its lines contains the install.packages("xtable") command.
16 Answers
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How to implement an ordered, default dict? [duplicate]
... try:
return OrderedDict.__getitem__(self, key)
except KeyError:
return self.__missing__(key)
def __missing__(self, key):
if self.default_factory is None:
raise KeyError(key)
self[key] = value = self.default_factory()
ret...
Why does volatile exist?
... edited Feb 10 '12 at 17:41
Flexo♦
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answered Sep 16 '08 at 14:04
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廉价共享存储解决方案2-drbd+cman+gfs2 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...nd check in:
.ssh/authorized_keys
to make sure we haven't added extra keys that you weren't expecting.
[root@gfs_2 ~]# ssh-keygen -t rsa -P ''
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
Your identification has been saved in /root/.s...
Singleton with Arguments in Java
I was reading the Singleton article on Wikipedia and I came across this example:
20 Answers
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Entity Framework: There is already an open DataReader associated with this Command
...anding of this problem is that there are multiple data retrieval commands executed on single connection (or single command with multiple selects) while next DataReader is executed before first one has completed the reading. The only way to avoid the exception is to allow multiple nested DataReaders ...
How to position a DIV in a specific coordinates?
...
Script its left and top properties as the number of pixels from the left edge and top edge respectively. It must have position: absolute;
var d = document.getElementById('yourDivId');
d.style.position = "absolute";
d.style.left = x_pos+'px';
d.style.top = y_pos+'px';
Or do i...
Breaking up long strings on multiple lines in Ruby without stripping newlines
... project, we often have strings that are a little bit longer - i.e. " User X wanted to send you a message about Thing Y " that doesn't always fit within the 80 character style limit.
...
How to move the cursor word by word in the OS X Terminal
...
Out of the box you can use the quite bizarre Esc+F to move to the beginning of the next word and Esc+B to move to the beginning of the current word.
share
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Linq to Entities - SQL “IN” clause
... user rights if it contains the current item's applicable value. This is exactly the same way you would find an item in a regular list in .NET.
There are two ways of doing this using LINQ, one uses query syntax and the other uses method syntax. Essentially, they are the same and could be used int...