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What is the most efficient way to create a dictionary of two pandas Dataframe columns?
...0,2),columns=list('AB'))
In [7]: %timeit dict(zip(df.A,df.B))
1000 loops, best of 3: 1.27 ms per loop
In [8]: %timeit pd.Series(df.A.values,index=df.B).to_dict()
1000 loops, best of 3: 987 us per loop
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Perform Segue programmatically and pass parameters to the destination view
...l can be string, int, or like in this case it's a model that contains many items
- (void)someMethod {
[self performSegueWithIdentifier:@"loginMainSegue" sender:self];
}
OR...
- (void)someMethod {
UIViewController *myController = [self.storyboard instantiateViewControllerWithIdentifier:...
Using arrays or std::vectors in C++, what's the performance gap?
...ies:
Dynamic arrays
Using a pointer to a malloc-ed/new-ed array will be at best as fast as the std::vector version, and a lot less safe (see litb's post).
So use a std::vector.
Static arrays
Using a static array will be at best:
as fast as the std::array version
and a lot less safe.
So use a std::...
GIF Animated 扩展：可点击透明背景动画GIF播放器 · App Inventor 2 中文网
...px 15px rgba(0, 0, 0, .1); display: flex; flex-direction: column; align-items: center; } .feedback-pop:hover, .feedback-pop .feedback-img:hover { color: #3773f5 } .feedback-pop .feedback-img { display: inline-block; width: 24px; height: 24px; margin-bottom: 4px; background: url(/static/imag...
Stretch child div height to fill parent that has dynamic height
...For the parent div:
style="display: flex;"
For child div:
style="align-items: stretch;"
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Iterating over each line of ls -l output
... | awk '{print $9, $5}'
.. on my system prints the name and size of each item in the directory.
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How do I make a matrix from a list of vectors in R?
...e between this and the standard rbind() is that do.call() passes each list item as a separate arg - is that right? do.call(rbind,a) is equivalent to rbind(a[[1]], a[[2]]... a[[10]])?
– Matt Parker
Aug 25 '09 at 18:57
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Uploading images using Node.js, Express, and Mongoose
...t referred that way and I'm going to go ahead and say that these guys know best developer.mozilla.org/en-US/docs/JavaScript/Guide/… so I guess we are both wrong ;)
– srquinn
Apr 19 '13 at 0:17
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Can't find how to use HttpContent
...sed Visual Studio's "Class Diagram" feature (Right-click your project, Add Item, Class Diagram. Then you can go thru Solution Explorer and expand References to get diagrams of libraries you reference.) docs.microsoft.com/en-us/visualstudio/ide/…
– Arin
Jul 5 ...
How to get a URL parameter in Express?
...
This can be used for validations or grabbing important information about item.
An example for this would be:
// parameter middleware that will run before the next routes
app.param('tagid', function(req, res, next, tagid) {
// check if the tagid exists
// do some validations
// add something to ...