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Channi Studies

Ordinary Least Squares (OLS)

Since I've started to use Obsidian for summarizing my leranings, I will upload the PDF of the note in this blog from now on. Open in new tab
Data Science 2025. 10. 18. 06:18
[Java] Stack with IntNode, two-stack reverse trick

Let's try implementing a Stack in Java using IntNode. The structure of IntNode looks like this: private static class IntNode() { int val; IntNode next; IntNode(int val, IntNode next) { this.val = val; this.next = next; }} We're going to put this private static IntNode class into the Stack class. We call it nested classes, and there are times when we should declare it a..
Data Science/Data Structure & Algorithm 2025. 9. 8. 06:18
[Numpy] Numpy Basics (.ipynb)

This Jupyter Notebook file tells you about the numpy array (numpy.ndarray) basics. Creating different shaped array, reshaping, random array, array indexing, etc.
Data Science/Python 2025. 9. 1. 04:49
[Java] Generic Types of List

To create an ArrayList (or LinkedList) in Java, you can do as following:import java.util.ArrayList;import java.util.List;public class Main { public static void main(String[] args) { List myList = new ArrayList(); myList.add(10); myList.add("Go"); myList.add(false); System.out.println(myList); // [10, Go, false] }}If we do not specify the type of the eleme..
Data Science/Data Structure & Algorithm 2025. 8. 31. 04:46
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