Programming

Questions about C#, Python, Java, algorithms, and code architecture.

ProgrammingGit: HEAD vs Working Tree vs Index (Staging Area)

Understand the key differences in Git between HEAD (pointer to current commit), working tree (editable files on disk), and index/staging area (snapshot for next commit). Learn workflow, commands like git status, git add, and common confusions like detached HEAD.

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ProgrammingHow to Access Ith Column of NumPy Multidimensional Array

Learn how to efficiently access the ith column in a NumPy array using slicing like test[:, i]. Get the first column [1, 3, 5] from [[1,2],[3,4],[5,6]]. Fast views, no copying, perfect for large numpy arrays and indexing.

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ProgrammingWhat Does ^M Mean in Vim? Remove from .vimrc File

Discover what the ^M character means in Vim—it's a carriage return from Windows CRLF line endings. Learn to remove ^M from .vimrc files using :%s/\r//g, :set ff=unix, or dos2unix to fix configuration issues and ensure Unix compatibility.

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ProgrammingNeorg Tangle Multiple Files: Fix Syntax & Concurrency

Solve Neorg tangle multiple files issues: restore syntax highlighting with Treesitter parsers like conf/sh and fix concurrency failures by setting core.tangle concurrency=1 for reliable literate programming exports without retries.

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ProgrammingGit Clone Error: Destination Path Already Exists Fix

Fix 'fatal: destination path "." already exists and is not an empty directory' Git clone error in current directory. Check hidden files with ls -a, use git init + remote add + fetch, or temp clone workaround for success.

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ProgrammingPython: Delete File If Exists - Pathlib One-Liner

Most Pythonic way to delete a file if it exists: Path.unlink(missing_ok=True) beats os.path.exists() + os.remove(). Avoid race conditions with concise pathlib or try/except os.remove for older Python.

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ProgrammingHow to Build IntelliJ JAR with Classes & Dependencies

Fix empty IntelliJ JAR issues: step-by-step guide to build proper intellij jar for single-module Java projects. Include compiled classes, place jar intellij idea dependencies separately, and verify with IntelliJ build jar tools.

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ProgrammingPL/SQL Session State for HTML Forms with HTP & DBMS_SESSION

Elegant PL/SQL solution using Oracle session contexts and DBMS_SESSION for multi-step HTML web forms with HTP. Reduce parameter passing, modularize code, handle arrays in mod_plsql apps for scalable state management.

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ProgrammingRetry Logic in skel_read() usb-skeleton.c Linux USB Driver

Analyze retry logic inconsistency in skel_read() of Linux kernel usb-skeleton.c. Understand partial reads, USB bulk transfers, adding goto retry safety, O_NONBLOCK handling, and best practices for USB drivers.

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ProgrammingLLM Fine-Tuning Data Formats, RAG & AI Datasets Guide

Discover data formats for fine-tuning LLMs like CSV/JSONL prompts, RAG query-context triples, and top AI datasets from Hugging Face for training mini LLMs. Essential guide for instruction tuning and RAG systems.

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ProgrammingEfficient Letter Boxed Solver Algorithm Guide

Optimal algorithm for Letter Boxed word game: bitmask DP, BFS on (mask, last), admissible heuristics like set-cover bounds, pruning techniques for minimal words. Fast for L=12 puzzles with chaining and coverage.

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ProgrammingWhy math.sqrt Faster Than x**0.5 in Python Square Root

Discover why math.sqrt(x) outperforms x**0.5 in Python square root calculations. Benchmarks show 20-30% faster speed due to optimized C implementation vs general exponentiation. Python performance tips included.

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ProgrammingFix Verilog FIR Filter Testbench Missing y[0]=0x0000

Debug Verilog FIR filter testbench failing to log y[0]=0x0000, skipping to y[1]=0xFFFE. Fix timing races, fixed-point scaling, rounding, saturation, and inconsistent outputs across implementations with code patches.

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ProgrammingLearn Data Science: Hands-On Projects, AI & Googling

Yes, hands-on mini-projects, effective Googling, and AI for tasks/debugging outperform syntax memorization in data science learning. Get tips for long-term retention, faster problem-solving, and building a portfolio with real projects like Titanic.

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ProgrammingMathcad: Count Elements Divisible by 3 Per Row Vector

Learn how to create a vector in Mathcad counting elements divisible by 3 in each row of matrix M. Use vectorized sum with mod or programming loops for efficient row-wise counts.

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ProgrammingGoogle Sheets Formula: Append Date to Filtered Names

Modify your Google Sheets formula using TEXTJOIN and FILTER to append dates to recipient names like 'Name (Date)'. Perfect for tracking sheets with Product ID, status, and country filters. Step-by-step guide and examples.

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ProgrammingTLS 1.3 mTLS with BouncyCastle: client cert missing

Troubleshoot BouncyCastle TLS 1.3 mTLS: verify Certificate/CertificateVerify messages, ensure PKCS#8 private key bytes, and prefer RSA-PSS signatures.

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ProgrammingSpring Boot multi-module: load @Configuration in JAR

Ensure @Configuration and @Primary beans from dependencies load in Spring Boot fat JARs by packaging shared modules as plain JARs and fixing mainClass.

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ProgrammingCalculate Used Blocks from Overflowing uint32 Counters

Fix counter overflow issues to accurately compute used memory blocks in a 20k pool using uint32_t alloc_num and free counters. Handle wrapping, sum overflow, edge cases, and concurrency for reliable counter memory tracking.

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ProgrammingTDD: Immutable Order Static Factory vs Mutable Java

In test driven development, model 'place order' intent with static factory, private constructor, and OrderState enum. Advantages over mutable setters, trade-offs, DDD tips, and TDD code examples for Java design patterns.

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