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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...
App Inventor 2 SQLite 拓展：超流行兼容主流SQL语法的迷你本地数据库引擎...
...名，这些名称在任何数据库中都不建议使用中文。
与 TaifunSQLite 功能类似，但TaifunSQLite是收费的，美刀。
1.3版本更新（2025/09/24）
查询SQL结果优化为AppInventor标准的二维列表，通过列表索引可以取到单元格...
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...
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...
Inheriting class methods from modules / mixins in Ruby
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How do I immediately execute an anonymous function in PHP?
In JavaScript, you can define anonymous functions that are executed immediately:
9 Answers
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Best way to change the background color for an NSView
... change the backgroundColor of an NSView . I'd also like to be able to set the appropriate alpha mask for the NSView . Something like:
...
send/post xml file using curl command line
How can I send/post an xml file to a local server http://localhost:8080 using curl from the command line?
8 Answers
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Get a filtered list of files in a directory
...ns for filtering, and it can have some memory overhead for very large data sets, but for listing a directory and other simple string filtering tasks, list comprehensions lead to more clean documentable code.
The only thing about this design is that it doesn't protect you against making the mistake ...
How can I save an image with PIL?
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