大约有 48,000 项符合查询结果（耗时：0.0595秒） [XML]
Repeat each row of data.frame the number of times specified in a column
...
Here's one solution:
df.expanded <- df[rep(row.names(df), df$freq), 1:2]
Result:
var1 var2
1 a d
2 b e
2.1 b e
3 c f
3.1 c f
3.2 c f
share
|
im...
IOS 7 Navigation Bar text and arrow color
...
|
edited Aug 25 '14 at 14:11
Alex Cio
5,67644 gold badges3939 silver badges7373 bronze badges
...
Why does PostgreSQL perform sequential scan on indexed column?
...
231
If the SELECT returns more than approximately 5-10% of all rows in the table, a sequential sca...
Batch script loop
I need to execute a command 100-200 times, and so far my research indicates that I would either have to copy/paste 100 copies of this command, OR use a for loop, but the for loop expects a list of items, hence I would need 200 files to operate on, or a list of 200 items, defeating the point.
...
lenses, fclabels, data-accessor - which library for structure access and mutation is better
...
200
There are at least 4 libraries that I am aware of providing lenses.
The notion of a lens is t...
How does deriving work in Haskell?
...
|
edited Jan 26 '16 at 10:40
Lii
9,43055 gold badges5151 silver badges7070 bronze badges
an...
Resolve Type from Class Name in a Different Assembly
...d assembly name like such:
Type.GetType("System.String, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089");
share
|
improve this answer
|
follow
...
setuptools: package data folder location
...ge, but the code doesn't need to change:
/Users/pat/virtenv/foo/lib/python2.6/site-packages/foo-0.0.0-py2.6.egg/foo/data/resource1/foo.txt
Option 2: Install to fixed location
The alternative would be to place your data outside the Python package and then
either:
Have the location of data pas...
difference and when to use getApplication(), getApplicationContext(), getBaseContext() and someClass
...
218
Toast and Intent, both requires reference to context. And getApplication, getApplicationContex...
Should you always favor xrange() over range()?
...
12 Answers
12
Active
...