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What does .SD stand for in data.table in R
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3 Answers
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Two-dimensional array in Swift
...ray of arrays of Ints set to 0. Arrays size is 10x5
var arr = Array(count: 3, repeatedValue: Array(count: 2, repeatedValue: 0))
// ...and for Swift 3+:
var arr = Array(repeating: Array(repeating: 0, count: 2), count: 3)
Change element at position
arr[0][1] = 18
OR
let myVar = 18
arr[0][1] = m...
win7 安装项目管理工具redmine2.5.1 - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...ller-community-5.6.17.0.msi
ImageMagick-6.8.9-2-Q16-x86-dll.exe
mysql2-0.3.16.gem
mysql-connector-c-6.1.3-win32.zip
rmagick-2.13.1-x86-mingw32.gem
windows下建议全部下载32位版本的软件，windows下的依赖解决太痛苦了。同时建议用google搜，有的软件包发放在git...
Numpy argsort - what is it doing?
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Returns the indices that would sort an array.
2 is the index of 0.0.
3 is the index of 0.1.
1 is the index of 1.41.
0 is the index of 1.48.
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How to check whether a pandas DataFrame is empty?
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edited Dec 15 '17 at 17:37
Dave Thomas
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sqlite3-ruby install error on Ubuntu
I have the following error during sqlite3-ruby install:
19 Answers
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From ND to 1D arrays
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283
Use np.ravel (for a 1D view) or np.ndarray.flatten (for a 1D copy) or np.ndarray.flat (for an 1D...
Rails I18n validation deprecation warning
...precation warning is now displayed both in Rails 4 (>= 4.0.2) and Rails 3.2 (>= 3.2.14). The reason is explained in this commit.
Enforce available locales
When I18n.config.enforce_available_locales is true we'll raise an
I18n::InvalidLocale exception if the passed locale is unavaila...
Why can't I use a list as a dict key in python?
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There's a good article on the topic in the Python wiki: Why Lists Can't Be Dictionary Keys. As ...