大约有 22,536 项符合查询结果（耗时：0.0371秒） [XML]
Pandas dataframe get first row of each group
...nth(0) is the same as first()):
df.groupby('id').nth(1)
Documentation: http://pandas.pydata.org/pandas-docs/stable/groupby.html#taking-the-nth-row-of-each-group
share
|
improve this answer
...
TCP loopback connection vs Unix Domain Socket performance
...
given that the first link is dead (HTTP 404)... this is why stackoverflow best-practice is to at least provide a short/concise relevant quote from the source URL at the time of the answer writing (then when the link goes down the short summary is still availab...
Devise form within a different controller
...ise_mapping
@devise_mapping ||= Devise.mappings[:user]
end
Source: http://pupeno.com/blog/show-a-devise-log-in-form-in-another-page/
share
|
improve this answer
|
fol...
Global access to Rake DSL methods is deprecated
...+) you may also want to verify that your environment is clean by using RVM http://beginrescueend.com/ and creating a specific ruby & gemset for your projects.
Use an .rvmrc file on a per-project basis, this will guarantee you aren't getting older system gems into your projects. Which has bit...
Storing R.drawable IDs in XML array
... item at this index
For more information about TypedArray visit this link
http://developer.android.com/reference/android/content/res/TypedArray.html
share
|
improve this answer
|
...
How does Chrome's “Request Desktop Site” option work?
... case it just reloads somesite.com/m.
I would expect that this works with HTTP 301 and 302 redirects, I know it works with document.location changes (at least as described), and would speculate that it works with <meta> refreshes.
...
Is there any way to close a StreamWriter without closing its BaseStream?
...
.NET 4.5 got new method fot that!
http://msdn.microsoft.com/EN-US/library/gg712853(v=VS.110,d=hv.2).aspx
public StreamWriter(
Stream stream,
Encoding encoding,
int bufferSize,
bool leaveOpen
)
...
Update parent scope variable in AngularJS
...entobj.parentproperty = "this WILL modify the parent";
});
Working demo: http://jsfiddle.net/sh0ber/xxNxj/
See What are the nuances of scope prototypal / prototypical inheritance in AngularJS?
share
|
...
Why doesn't Java offer operator overloading?
...++ Matrix object":
// C++ YMatrix matrix implementation on CodeProject
// http://www.codeproject.com/KB/architecture/ymatrix.aspx
// A, B, C, D, E, F are Matrix objects;
E = A * (B / 2) ;
E += (A - B) * (C + D) ;
F = E ; // deep copy of the matrix
// Java JAMA matrix implementat...
Formatting text in a TextBlock
...
a good site, with good explanations:
http://www.wpf-tutorial.com/basic-controls/the-textblock-control-inline-formatting/
here the author gives you good examples for what you are looking for! Overal the site is great for research material plus it covers a great ...