大约有 17,000 项符合查询结果（耗时：0.0209秒） [XML]
What does .SD stand for in data.table in R
... which other covariates are included in the specification?
Here's a short script leveraging the power of .SD which explores this question:
# this generates a list of the 2^k possible extra variables
# for models of the form ERA ~ G + (...)
extra_var = c('yearID', 'teamID', 'G', 'L')
models =
l...
“Could not find bundler” error
...ct folder do:
bundle install
and then you can run your project using:
script/rails server
share
|
improve this answer
|
follow
|
...
In C/C++ what's the simplest way to reverse the order of bits in a byte?
...
@wilhelmtell: Well, to write the script one still needs another solution, which was my point – a lookup table is simple to use but not simple to create. (Except by copying a ready-made lookup table, but then one might just as well copy any solution.) For e...
Is there an equivalent of 'which' on the Windows command line?
As I sometimes have path problems, where one of my own cmd scripts is hidden (shadowed) by another program (earlier on the path), I would like to be able to find the full path to a program on the Windows command line, given just its name.
...
R command for setting working directory to source file location in Rstudio
...
To get the location of a script being sourced, you can use utils::getSrcDirectory or utils::getSrcFilename. So changing the working directory to that of the current file can be done with:
setwd(getSrcDirectory()[1])
This does not work in RStudio ...
Difference between MEAN.js and MEAN.io
I wanted to use the MEAN JavaScript Stack, but I noticed that there are two different stacks with either their own website and installation methods: mean.js and mean.io. So I came up asking myself this question: "Which one do I use?".
...
jQuery if checkbox is checked
...
In CoffeeScript: if $('#my_checkbox').is ':checked'
– Dennis
Feb 21 '14 at 16:53
12
...
Redirect stdout to a file in Python?
...
If you want to do the redirection within the Python script, setting sys.stdout to a file object does the trick:
import sys
sys.stdout = open('file', 'w')
print('test')
A far more common method is to use shell redirection when executing (same on Windows and Linux):
$ python...
How to find largest objects in a SQL Server database?
...
I've been using this SQL script (which I got from someone, somewhere - can't reconstruct who it came from) for ages and it's helped me quite a bit understanding and determining the size of indices and tables:
SELECT
t.name AS TableName,
i.n...
How to get full path of selected file on change of using javascript, jquery-ajax
...
For security reasons browsers do not allow this, i.e. JavaScript in browser has no access to the File System, however using HTML5 File API, only Firefox provides a mozFullPath property, but if you try to get the value it returns an empty string:
$('input[type=file]').change(functio...