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How do I determine k when using k-means clustering?
...X | C) - (p / 2) * log n
where L(X | C) is the log-likelihood of the dataset X according to model C, p is the number of parameters in the model C, and n is the number of points in the dataset.
See "X-means: extending K-means with efficient estimation of the number of clusters" by Dan Pelleg and An...
not None test in Python [duplicate]
...None:
# ...
is the Pythonic idiom for testing that a variable is not set to None. This idiom has particular uses in the case of declaring keyword functions with default parameters. is tests identity in Python. Because there is one and only one instance of None present in a running Python scrip...
Win7以上操作系统清理系统图标缓存脚本 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...理系统图标缓存脚本rem 关闭Windows外壳程序explorertaskkill f im explorer.exerem 清理系统图标缓存数据库attrib -h -s -r "%userprofile% AppDa...
rem 关闭Windows外壳程序explorer
taskkill /f /im explorer.exe
rem 清理系统图标缓存数据库
attrib -h -s -r "%use...
How to jump from Intellij terminal to editor with shortcut
...ed local terminal and editor by pressing...". You can remap this action in Settings > Keymap > Other > Terminal
The main "issue" this question discusses is if there is a way to return from the terminal window to the editor without closing the terminal window.
[End March 2016 update]
===...
How does Duff's device work?
...f the program for the first pass is:
int count; // Set to 20
{
int n = (count + 7) / 8; // n is now 3. (The "while" is going
// to be run three times.)
switch (count % 8) { // The remainder is 4 (20 modulo...
Printing the last column of a line in a file
I have a file that is constantly being written to/updated. I want to find the last line containing a particular word, then print the last column of that line.
...
Git, see a list of comments of my last N commits
...t I have for zsh)
alias glog="git log --graph --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%an>%Creset' --abbrev-commit"
Now, I can just use:
glog -n 5
And I get a nice output such as:
Which is colourised, shows the name of the author and also sho...
Call a function with argument list in python
... editor after snippets, if snippets enabled
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How can you zip or unzip from the script using ONLY Windows' built-in capabilities?
...act into the actual directory (instead of creating a new directory) simply set the target parameter to '.', e.g.: powershell.exe -nologo -noprofile -command "& { Add-Type -A 'System.IO.Compression.FileSystem'; [IO.Compression.ZipFile]::ExtractToDirectory('foo.zip', '.'); }"
...
Global and local variables in R
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