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How to map with index in Ruby?
...erator object (in 1.8.7+), which mixes in Enumerable, so you can call map, select, reject etc. on it just like on an array, hash, range etc.
– sepp2k
Jan 15 '11 at 1:45
9
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Removing path and extension from filename in powershell
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you can use basename property
PS II> ls *.ps1 | select basename
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How to combine multiple conditions to subset a data-frame using “OR”?
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filter(df, v1 < 0.5 | v2 == "g")
Using sqldf:
library(sqldf)
sqldf('SELECT *
FROM df
WHERE v1 < 0.5 OR v2 = "g"')
Output for the above options:
v1 v2
1 0.26550866 a
2 0.37212390 b
3 0.20168193 e
4 0.94467527 g
5 0.06178627 j
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SVN change username
...r Authentication Data, click on the clear button, and it will allow you to select which connection you wanted to clear userid/pwd for.
After you do this, any checkout or update activity, it will reprompt for the userid and password.
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Expand a random range from 1–5 to 1–7
...t a non-zero. That's what this code is doing: the i and j indexes randomly select a location on the dart board, and if we don't get a good result, we keep throwing darts.
Like Adam said, this can run forever in the worst case, but statistically the worst case never happens. :)
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mysql: see all open connections to a given database?
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That should do the trick for the newest MySQL versions:
SELECT * FROM INFORMATION_SCHEMA.PROCESSLIST WHERE DB = "elstream_development";
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How to “set a breakpoint in malloc_error_break to debug”
...Navigator or ⌘8), clicking the plus button in the lower left corner, and selecting "Add Symbolic Breakpoint". In the popup that comes up, enter malloc_error_break in the Symbol field, then click Done.
EDIT: openfrog added a screenshot and indicated that he's already tried these steps without succe...
Why shouldn't all functions be async by default?
...eason to make all methods async if they are not needed to - extensibility. Selective making methods async only works if your code never evolves and you know that method A() is always CPU-bound (you keep it sync) and method B() is always I/O bound (you mark it async).
But what if things change? Yes,...
Set a path variable with spaces in the path in a Windows .cmd file or batch file
...art)
Run the Command Prompt as administrator (Right click on cmd.exe and select run as administrator)
In cmd
setx path "%path%;your new path"
then enter
Check whether the path is taken correctly by typing path and pressing enter
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Click Event on UIImageView programmatically in ios
...r *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapDetected)];
singleTap.numberOfTapsRequired = 1;
[preArrowImage setUserInteractionEnabled:YES];
[preArrowImage addGestureRecognizer:singleTap];
-(void)tapDetected{
NSLog(@"single Tap on imageview");
}
SWIF...