大约有 48,000 项符合查询结果（耗时：0.0322秒） [XML]
rvm installation not working: “RVM is not a function”
...on, --auto had been deprecated in favour of --auto-dotfiles so the command now is rvm get stable --auto-dotfiles
– Mart Van de Ven
Nov 8 '13 at 3:56
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SQL multiple column ordering
...en performs STABLE sorting by column1. This is more clear for people that knows what stable sorting is.
– Atom
Oct 3 '16 at 13:49
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Calculating moving average
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Some years later but dplyr now has a filter function, if you have this package loaded use stats::filter
– blmoore
Apr 8 '15 at 14:00
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How to implement the Android ActionBar back button?
...ress the back button. This should be done in the AndroidManifest.xml too.
Now you can enable the back button in the onCreate method of your "child" activity.
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getActionBar().setDisplayHomeAsUp...
Multiple github accounts on the same computer?
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The 3rd link is now broken (Multiple SSH Keys)
– RustyTheBoyRobot
Jun 1 '12 at 14:25
12
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How do you 'redo' changes after 'undo' with Emacs?
...e that looks like this:
Insert "foo"
Insert "bar"
Insert "I love spam"
Now, you undo. It undoes the last action, resulting in the following list:
Insert "foo"
Insert "bar"
If you do something other than undo at this point - say, C-f, the operation stack looks like this:
Insert "foo"
Inser...
In Firebase, is there a way to get the number of children of a node without loading all the node dat
...way to count children without loading data, but we do plan to add it.
For now, one solution would be to maintain a counter of the number of children and update it every time you add a new child. You could use a transaction to count items, like in this code tracking upvodes:
var upvotesRef = new Fi...
Writing files in Node.js
... he wanted to save the file on /home directory I suggested to chmod it. I know it could generate a security issue. But well, if the user wants to save there, that's the solution. P.S: I agree with what you said (:
– Denys Vitali
Jan 29 '14 at 22:51
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Pandas get topmost n records within each group
...
Yes, I think that's it. Overlooked this somehow. Do you know good way to number records within group?
– Roman Pekar
Nov 19 '13 at 10:48
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How to define a two-dimensional array?
...w, h = 8, 5;
Matrix = [[0 for x in range(w)] for y in range(h)]
You can now add items to the list:
Matrix[0][0] = 1
Matrix[6][0] = 3 # error! range...
Matrix[0][6] = 3 # valid
Note that the matrix is "y" address major, in other words, the "y index" comes before the "x index".
print Matrix[0]...