A weblog by Xingxin He, a programmer working in Shanghai, about notes and ideas.https://blog.xingxinhe.com/https://blog.xingxinhe.com/2026/04/phd-chronicle-week-034-the-recharge-sprint/https://blog.xingxinhe.com/2026/04/phd-chronicle-week-034-the-recharge-sprint/A "Recharge Sprint" break exploring control theory, MoveIt 2, and lessons from the LeRobot team.Sun, 12 Apr 2026 00:00:00 GMThttps://blog.xingxinhe.com/2026/04/deriving-euler-lagrange-equation-of-a-simple-double-pendulum/https://blog.xingxinhe.com/2026/04/deriving-euler-lagrange-equation-of-a-simple-double-pendulum/A step-by-step calculus refresher on deriving double pendulum dynamics using the Lagrangian method.Wed, 08 Apr 2026 00:00:00 GMThttps://blog.xingxinhe.com/2026/04/phd-chronicle-week-033-grasp-in-reality-and-simulation/https://blog.xingxinhe.com/2026/04/phd-chronicle-week-033-grasp-in-reality-and-simulation/Tackling co-training, the Sim2Real gap of capacitive touchpads, and grasping issues with Franka.Sat, 04 Apr 2026 00:00:00 GMThttps://blog.xingxinhe.com/2026/03/the-it-just-works-hardware-and-os-stack-for-franka-robot/https://blog.xingxinhe.com/2026/03/the-it-just-works-hardware-and-os-stack-for-franka-robot/A proven, no-fluff mini PC and Ubuntu 24.04 real-time setup guide for Franka robotics developers.Mon, 30 Mar 2026 00:00:00 GMThttps://blog.xingxinhe.com/2026/03/phd-chronicle-week-032-franka-teleop-and-co-training/https://blog.xingxinhe.com/2026/03/phd-chronicle-week-032-franka-teleop-and-co-training/Teleoperating the Franka FR3, exploring Control Barrier Functions, and prepping ROS2 TA labs.Mon, 30 Mar 2026 00:00:00 GMThttps://blog.xingxinhe.com/2026/03/how-to-enable-zero-gravity-teleoperating-a-franka-robot/https://blog.xingxinhe.com/2026/03/how-to-enable-zero-gravity-teleoperating-a-franka-robot/Learn how to configure a Franka Research 3 robot for zero-gravity kinesthetic teaching in FCI mode.Sun, 22 Mar 2026 00:00:00 GMThttps://blog.xingxinhe.com/2026/03/phd-chronicle-week-031-first-imitation-learning-demo/https://blog.xingxinhe.com/2026/03/phd-chronicle-week-031-first-imitation-learning-demo/Built my first full imitation learning pipeline! From data collection to real robot deployment.Sat, 21 Mar 2026 00:00:00 GMThttps://blog.xingxinhe.com/2026/03/understanding-pd-controllers-in-robotics-and-robot-learning/https://blog.xingxinhe.com/2026/03/understanding-pd-controllers-in-robotics-and-robot-learning/A practical guide to PD controllers in robotics and how they shape action spaces for robot learning.Mon, 16 Mar 2026 00:00:00 GMThttps://blog.xingxinhe.com/2026/03/phd-chronicle-week-030-back-to-personal-blogging/https://blog.xingxinhe.com/2026/03/phd-chronicle-week-030-back-to-personal-blogging/Why I abandoned the newsletter format to document my personal robotics PhD journey in the AI era.Sat, 14 Mar 2026 00:00:00 GMThttps://blog.xingxinhe.com/2026/03/multi-machine-ros2-for-robot-learning-a-guide-to-rmw/https://blog.xingxinhe.com/2026/03/multi-machine-ros2-for-robot-learning-a-guide-to-rmw/A practical guide to configuring ROS 2 Middleware (CycloneDDS and Zenoh) for multi-machine robotics.Tue, 10 Mar 2026 00:00:00 GMThttps://blog.xingxinhe.com/2026/03/how-to-install-ros2-without-docker-or-sudo-apt-in-2026/https://blog.xingxinhe.com/2026/03/how-to-install-ros2-without-docker-or-sudo-apt-in-2026/Set up a ROS 2 workspace without Docker or sudo apt. Learn how to use Pixi for clean robotics dev.Sat, 07 Mar 2026 00:00:00 GMThttps://blog.xingxinhe.com/2026/03/phd-chronicle-week-029-robocasa365/https://blog.xingxinhe.com/2026/03/phd-chronicle-week-029-robocasa365/Covering RoboCasa365 benchmark, CS336 language modeling course, Pixi for ROS2, and WezTerm terminal emulator.Mon, 02 Mar 2026 00:00:00 GMThttps://blog.xingxinhe.com/2026/02/how-to-derive-the-policy-gradient-with-monte-carlo-sampling/https://blog.xingxinhe.com/2026/02/how-to-derive-the-policy-gradient-with-monte-carlo-sampling/Master the math behind the Policy Gradient algorithm with this intuitive, step-by-step breakdown.Sat, 28 Feb 2026 00:00:00 GMThttps://blog.xingxinhe.com/2026/02/phd-chronicle-week-028-back-from-holiday/https://blog.xingxinhe.com/2026/02/phd-chronicle-week-028-back-from-holiday/Enjoy my Chinese New Year!Sat, 28 Feb 2026 00:00:00 GMThttps://blog.xingxinhe.com/2026/02/understanding-action-chunking-with-flow-matching/https://blog.xingxinhe.com/2026/02/understanding-action-chunking-with-flow-matching/A beginner-friendly guide to applying Flow Matching for action chunking in robot imitation learning.Sun, 22 Feb 2026 00:00:00 GMThttps://blog.xingxinhe.com/2026/02/a-beginner-guide-to-flow-matching/https://blog.xingxinhe.com/2026/02/a-beginner-guide-to-flow-matching/An intuitive, beginner-friendly guide to Flow Matching, ODEs, and vector fields with Python code.Sat, 21 Feb 2026 00:00:00 GMThttps://blog.xingxinhe.com/2026/02/phd-chronicle-week-027-flow-matching-and-python-trick/https://blog.xingxinhe.com/2026/02/phd-chronicle-week-027-flow-matching-and-python-trick/Mastering imitation learning, Flow Matching, Tyro CLIs, and Python keyword-only arguments.Thu, 19 Feb 2026 00:00:00 GMThttps://blog.xingxinhe.com/2026/02/how-to-set-up-autograding-in-github-classroom-with-canvas/https://blog.xingxinhe.com/2026/02/how-to-set-up-autograding-in-github-classroom-with-canvas/A complete guide for TAs on using GitHub Classroom, setting up autograding, and syncing with Canvas.Fri, 13 Feb 2026 00:00:00 GMThttps://blog.xingxinhe.com/2026/02/phd-chronicle-week-026-course-infra-and-autograding/https://blog.xingxinhe.com/2026/02/phd-chronicle-week-026-course-infra-and-autograding/Balancing TA duties, setting up GitHub Classroom autograding, and prepping for the Chinese New Year!Fri, 13 Feb 2026 00:00:00 GMThttps://blog.xingxinhe.com/2026/02/why-naive-behavioral-cloning-does-not-work/https://blog.xingxinhe.com/2026/02/why-naive-behavioral-cloning-does-not-work/Why Behavioral Cloning fails due to distribution shift and how multi-camera setups fix it.Sat, 07 Feb 2026 00:00:00 GMThttps://blog.xingxinhe.com/2026/02/phd-chronicle-week-025-new-semester-in-2026/https://blog.xingxinhe.com/2026/02/phd-chronicle-week-025-new-semester-in-2026/Busy week TAing undergrads in C++, plus finally understanding why naive behavioral cloning fails.Sat, 07 Feb 2026 00:00:00 GMThttps://blog.xingxinhe.com/2026/02/why-the-gymnasium-api-looks-the-way-it-does/https://blog.xingxinhe.com/2026/02/why-the-gymnasium-api-looks-the-way-it-does/Connecting RL math to Gymnasium code: Why the API mirrors Probabilistic Graphical Models.Mon, 02 Feb 2026 00:00:00 GMThttps://blog.xingxinhe.com/2026/01/phd-chronicle-week-024-into-the-robot-learning-verse/https://blog.xingxinhe.com/2026/01/phd-chronicle-week-024-into-the-robot-learning-verse/Shifting to VLA research, exploring Robot Learning taxonomy, and bridging Sim2Real gaps in ManiSkill.Tue, 27 Jan 2026 00:00:00 GMThttps://blog.xingxinhe.com/2026/01/phd-chronicle-week-023-isaac-ros-and-ddp/https://blog.xingxinhe.com/2026/01/phd-chronicle-week-023-isaac-ros-and-ddp/Training on 6 GPUs with Hydra and Lightning, exploring Isaac ROS workspaces, and SpaceMouse teleop.Fri, 23 Jan 2026 00:00:00 GMThttps://blog.xingxinhe.com/2026/01/understanding-franka-robot-control-parameters/https://blog.xingxinhe.com/2026/01/understanding-franka-robot-control-parameters/A guide to Franka robot control parameters for smooth motion, explaining velocity, acceleration, jerk, and torque limits.Sun, 18 Jan 2026 00:00:00 GMThttps://blog.xingxinhe.com/2026/01/phd-chronicle-week-022-from-mujoco-stability-to-vla/https://blog.xingxinhe.com/2026/01/phd-chronicle-week-022-from-mujoco-stability-to-vla/Exploring MuJoCo simulation challenges, LeRobot for VLA data, and moving toward an Isaac ROS pipeline.Wed, 14 Jan 2026 00:00:00 GMThttps://blog.xingxinhe.com/2026/01/phd-chronicle-week-021-extrinsic-dexterity/https://blog.xingxinhe.com/2026/01/phd-chronicle-week-021-extrinsic-dexterity/Exploring sim2real gaps, 3D stacking, and how robots use extrinsic dexterity to reorient objects.Tue, 06 Jan 2026 00:00:00 GMThttps://blog.xingxinhe.com/2026/01/phd-chronicle-week-020-taming-the-transformer/https://blog.xingxinhe.com/2026/01/phd-chronicle-week-020-taming-the-transformer/Debugging Point Transformer V3 overfitting and fixing GPU bottlenecks in 3D Tetris pose estimation.Sun, 04 Jan 2026 00:00:00 GMThttps://blog.xingxinhe.com/2025/12/how-to-train-and-use-a-neural-network-tldr/https://blog.xingxinhe.com/2025/12/how-to-train-and-use-a-neural-network-tldr/A 6-step TL;DR guide to training your first neural network using PyTorch.Fri, 26 Dec 2025 00:00:00 GMThttps://blog.xingxinhe.com/2025/12/phd-chronicle-week-19-one-object-down-many-to-go/https://blog.xingxinhe.com/2025/12/phd-chronicle-week-19-one-object-down-many-to-go/Research breakthrough on 6D pose, PyTorch recap, and exploring Point Transformer V3 serialization.Thu, 25 Dec 2025 00:00:00 GMThttps://blog.xingxinhe.com/2025/12/what-is-ball-query-and-multi-scale-grouping/https://blog.xingxinhe.com/2025/12/what-is-ball-query-and-multi-scale-grouping/Explaining Ball Query and Multi-Scale Grouping in PointNet++ using a practical 3D Tetris example.Wed, 24 Dec 2025 00:00:00 GMThttps://blog.xingxinhe.com/2025/12/what-is-farthest-point-sampling/https://blog.xingxinhe.com/2025/12/what-is-farthest-point-sampling/Why Farthest Point Sampling beats random sampling for 3D point clouds, explained with Python code.Wed, 24 Dec 2025 00:00:00 GMThttps://blog.xingxinhe.com/2025/12/phd-chronicle-week-018-debugging-pointnet/https://blog.xingxinhe.com/2025/12/phd-chronicle-week-018-debugging-pointnet/Debugging poor PPR-Net++ performance on 3D Tetris shapes and analyzing PointNet++ configurations.Mon, 22 Dec 2025 00:00:00 GMThttps://blog.xingxinhe.com/2025/12/uv-sync-different-cuda-pytorch-and-torch-dependent-libraries/https://blog.xingxinhe.com/2025/12/uv-sync-different-cuda-pytorch-and-torch-dependent-libraries/Manage different CUDA/PyTorch in one project and add torch-dependent libraries easily with the uv manager.Sun, 21 Dec 2025 00:00:00 GMThttps://blog.xingxinhe.com/2025/12/phd-chronicle-week-017-my-first-slurm-job/https://blog.xingxinhe.com/2025/12/phd-chronicle-week-017-my-first-slurm-job/Accelerating synthetic dataset generation with HKUST's HPC and ensuring reliability through Python unit tests.Fri, 12 Dec 2025 00:00:00 GMThttps://blog.xingxinhe.com/2025/12/i-had-his-number-but-i-missed-the-meeting/https://blog.xingxinhe.com/2025/12/i-had-his-number-but-i-missed-the-meeting/A painful but necessary lesson on managing up and closing the loop.Sat, 06 Dec 2025 00:00:00 GMThttps://blog.xingxinhe.com/2025/12/phd-chronicle-week-016-back-to-deep-learning/https://blog.xingxinhe.com/2025/12/phd-chronicle-week-016-back-to-deep-learning/Starting a new task on 6D pose estimation for Tetris blocks using point clouds and PyTorch after five years.Tue, 02 Dec 2025 00:00:00 GMThttps://blog.xingxinhe.com/2025/11/phd-chronicle-week-015-thanks-giving/https://blog.xingxinhe.com/2025/11/phd-chronicle-week-015-thanks-giving/Turning gratitude into action: sending thank-you notes this Thanksgiving.Sun, 30 Nov 2025 00:00:00 GMThttps://blog.xingxinhe.com/2025/11/phd-chronicle-week-014-webgpu/https://blog.xingxinhe.com/2025/11/phd-chronicle-week-014-webgpu/My Advanced Computer Graphics course final project: real-time fluid sloshing inside a draggable badge inspired by Vercel.Sun, 23 Nov 2025 00:00:00 GMThttps://blog.xingxinhe.com/2025/11/phd-chronicle-week-013-taming-the-jerk/https://blog.xingxinhe.com/2025/11/phd-chronicle-week-013-taming-the-jerk/Implementing smooth, jerk-limited control for Franka by studying MoveIt2 source code.Mon, 17 Nov 2025 00:00:00 GMThttps://blog.xingxinhe.com/2025/11/phd-chronicle-week-012-teaching-assistant/https://blog.xingxinhe.com/2025/11/phd-chronicle-week-012-teaching-assistant/First TA gig for RoboFab. Prepping demos revealed how brutal good teaching is CS103! Respect!Sat, 08 Nov 2025 00:00:00 GMThttps://blog.xingxinhe.com/2025/10/phd-chronicle-week-011-trajectory/https://blog.xingxinhe.com/2025/10/phd-chronicle-week-011-trajectory/Ditched KUKA one-liner luxury. Now feeding Franka 1 ms pose streams...Fri, 31 Oct 2025 00:00:00 GMThttps://blog.xingxinhe.com/2025/10/how-to-version-large-git-datasets-with-dvc-and-r2/https://blog.xingxinhe.com/2025/10/how-to-version-large-git-datasets-with-dvc-and-r2/A step-by-step guide to versioning large Git datasets for free using DVC and Cloudflare R2.Tue, 28 Oct 2025 00:00:00 GMThttps://blog.xingxinhe.com/2025/10/phd-chronicle-week-010-reflex/https://blog.xingxinhe.com/2025/10/phd-chronicle-week-010-reflex/I show soft reset code vs. hauling joints free when singularity strikes...Mon, 27 Oct 2025 00:00:00 GMThttps://blog.xingxinhe.com/2025/10/phd-chronicle-week-009-out-of-control/https://blog.xingxinhe.com/2025/10/phd-chronicle-week-009-out-of-control/Stressful cloud setup, an awkward demo fail, and lessons on communication & debugging.Wed, 22 Oct 2025 00:00:00 GMThttps://blog.xingxinhe.com/2025/10/phd-chronicle-week-008-thankless-task/https://blog.xingxinhe.com/2025/10/phd-chronicle-week-008-thankless-task/Docker setup struggles, missed deadline, and the importance of communication.Sat, 11 Oct 2025 00:00:00 GMThttps://blog.xingxinhe.com/2025/10/vscode-mqtt-ssh-hpc/https://blog.xingxinhe.com/2025/10/vscode-mqtt-ssh-hpc/How to run GPU code on an HPC cluster from a local PC with VS Code? This is a step-by-step guide to do it.Thu, 02 Oct 2025 00:00:00 GMThttps://blog.xingxinhe.com/2025/10/phd-chronicle-week-007-mqtt-in-hpc/https://blog.xingxinhe.com/2025/10/phd-chronicle-week-007-mqtt-in-hpc/Success with MQTT on HPC! But slow disk I/O makes compilation sluggish for interactive tasks.Thu, 02 Oct 2025 00:00:00 GMThttps://blog.xingxinhe.com/2025/09/phd-chronicle-week-006-ragasa/https://blog.xingxinhe.com/2025/09/phd-chronicle-week-006-ragasa/C++ bindings, a 3D graphics project, and Typhoon Ragasa.Sun, 28 Sep 2025 00:00:00 GMThttps://blog.xingxinhe.com/2025/09/how-to-create-python-binding-for-cpp-libfranka-with-nanobind/https://blog.xingxinhe.com/2025/09/how-to-create-python-binding-for-cpp-libfranka-with-nanobind/Build a portable Python binding for C++ libfranka with nanobind, CMake, and auditwheel.Thu, 25 Sep 2025 00:00:00 GMThttps://blog.xingxinhe.com/2025/09/layer-image-container-in-docker/https://blog.xingxinhe.com/2025/09/layer-image-container-in-docker/My reflection on Docker's core concepts - layers, images, and containers when I was wresting with robotics.Wed, 24 Sep 2025 00:00:00 GMThttps://blog.xingxinhe.com/2025/09/phd-chronicle-week-005-experiment/https://blog.xingxinhe.com/2025/09/phd-chronicle-week-005-experiment/Get my hands dirty. Just experiment!Thu, 18 Sep 2025 00:00:00 GMThttps://blog.xingxinhe.com/2025/09/phd-chronicle-week-004-action/https://blog.xingxinhe.com/2025/09/phd-chronicle-week-004-action/OK. I should focous and take action!Thu, 11 Sep 2025 00:00:00 GMThttps://blog.xingxinhe.com/2025/08/phd-chronicle-week-003-different-robots/https://blog.xingxinhe.com/2025/08/phd-chronicle-week-003-different-robots/Two different kinds of manipulator robots I encountered with.Sat, 30 Aug 2025 00:00:00 GMThttps://blog.xingxinhe.com/2025/08/phd-chronicle-week-002-os/https://blog.xingxinhe.com/2025/08/phd-chronicle-week-002-os/My successful setup of a Franka 3 robot on Ubuntu 24.04, detailing the role of a Realtime Kernel.Fri, 29 Aug 2025 00:00:00 GMThttps://blog.xingxinhe.com/2025/08/phd-chronicle-week-001-onboarding/https://blog.xingxinhe.com/2025/08/phd-chronicle-week-001-onboarding/The first weekly reflection on my PhD journey at the HKUST.Sat, 23 Aug 2025 00:00:00 GMThttps://blog.xingxinhe.com/2025/07/what-is-a-package-json/https://blog.xingxinhe.com/2025/07/what-is-a-package-json/Answering the big questions about your first JavaScript project, package.json, npm, pnpm, bun, esm, commonjs, module, tsconfig.json etc.Sun, 20 Jul 2025 00:00:00 GMThttps://blog.xingxinhe.com/2025/05/how-to-store-json-to-an-env-variable/https://blog.xingxinhe.com/2025/05/how-to-store-json-to-an-env-variable/Secure Google Analytics credentials in env vars using Base64 encoding. No more JSON file risks!Thu, 22 May 2025 00:00:00 GMThttps://blog.xingxinhe.com/2025/05/diagram-mutating-data-in-next-js/https://blog.xingxinhe.com/2025/05/diagram-mutating-data-in-next-js/Explores Next.js CRUD with server functions, Zod validation, dynamic routes, and secure ID passing using bind().Mon, 12 May 2025 00:00:00 GMThttps://blog.xingxinhe.com/2025/05/diagram-search-and-pagination-in-next-js/https://blog.xingxinhe.com/2025/05/diagram-search-and-pagination-in-next-js/Better understand how search, pagination, app router work in Next.js with diagrams.Sun, 11 May 2025 00:00:00 GMThttps://blog.xingxinhe.com/2025/04/do-i-interpret-mediocristan-and-extremistan-correctly/https://blog.xingxinhe.com/2025/04/do-i-interpret-mediocristan-and-extremistan-correctly/This how I interpret Mediocristan and Extremistan coined by Nassim Taleb.Wed, 23 Apr 2025 00:00:00 GMThttps://blog.xingxinhe.com/2025/04/how-to-make-better-decision/https://blog.xingxinhe.com/2025/04/how-to-make-better-decision/In March 2025, I faced a question that kept me up at night. Where should I go next after leaving Autodesk?Tue, 01 Apr 2025 00:00:00 GMThttps://blog.xingxinhe.com/2025/02/who-is-theodorus-ibn-warqa/https://blog.xingxinhe.com/2025/02/who-is-theodorus-ibn-warqa/Theodorus Ibn Warqa is a composite of 2 tragic figures, Theodorus and Warqa where the "Ibnابن" refers to "son of" in Arabic .Fri, 28 Feb 2025 00:00:00 GMThttps://blog.xingxinhe.com/2025/02/why-do-we-have-to-pay-a-price-for-the-goods-we-consume/https://blog.xingxinhe.com/2025/02/why-do-we-have-to-pay-a-price-for-the-goods-we-consume/No prices mean overconsumption, scarcity, and collapse. Prices balance desire and resources, preventing societal inferno.Mon, 24 Feb 2025 00:00:00 GMThttps://blog.xingxinhe.com/2025/02/i-was-kidnapped-by-deprival-super-reaction-tendency/https://blog.xingxinhe.com/2025/02/i-was-kidnapped-by-deprival-super-reaction-tendency/Fell for the deprival-super reaction tendency during a visa photo session - upsold a candid shot I didn't need. Fear of losing it got me!Sat, 22 Feb 2025 00:00:00 GMThttps://blog.xingxinhe.com/2025/01/building-antifragile-system/https://blog.xingxinhe.com/2025/01/building-antifragile-system/The article discusses how systems can become antifragile by embracing randomness.Sat, 18 Jan 2025 11:14:00 GMThttps://blog.xingxinhe.com/2025/01/boost-productivity-using-powertoys-day-5-fancyzones/https://blog.xingxinhe.com/2025/01/boost-productivity-using-powertoys-day-5-fancyzones/Discover how to enhance your productivity using PowerToys on Windows by customizing app layouts.Mon, 13 Jan 2025 19:11:00 GMThttps://blog.xingxinhe.com/2025/01/use-webp-to-save-30-disk-space-of-your-obsidian-vault/https://blog.xingxinhe.com/2025/01/use-webp-to-save-30-disk-space-of-your-obsidian-vault/Obsidian is an amazing tool, but as your vault grows, so does its size. Images can quickly eat up storage...Sat, 11 Jan 2025 16:15:00 GMThttps://blog.xingxinhe.com/2025/01/making-sense-of-javascript-var-let-const-for-a-confused-c-developer/https://blog.xingxinhe.com/2025/01/making-sense-of-javascript-var-let-const-for-a-confused-c-developer/A C++ developer's view on these keywords.Thu, 09 Jan 2025 15:30:00 GMThttps://blog.xingxinhe.com/2025/01/the-triad-of-systems-input-process-output/https://blog.xingxinhe.com/2025/01/the-triad-of-systems-input-process-output/For a long time, I stumbled upon déjà-vu - a triad that appears everywhere, from the design of computers to the way we think about behavior and algorithms.Thu, 09 Jan 2025 12:56:00 GMThttps://blog.xingxinhe.com/2025/01/unit-cube-and-canonical-cube-are-different/https://blog.xingxinhe.com/2025/01/unit-cube-and-canonical-cube-are-different/If you've ever found yourself casually tossing around terms like unit cube and canonical cube, assuming they're interchangeable, you're not alone.Wed, 08 Jan 2025 20:12:00 GMThttps://blog.xingxinhe.com/2025/01/boost-productivity-using-powertoys-day-4-peek/https://blog.xingxinhe.com/2025/01/boost-productivity-using-powertoys-day-4-peek/Peek is a feature similar to the "Preview Pane" in Windows Explorer. However, it offers a richer display for developer files...Wed, 08 Jan 2025 08:21:00 GMThttps://blog.xingxinhe.com/2025/01/boost-productivity-using-powertoys-day-3-registry-preview/https://blog.xingxinhe.com/2025/01/boost-productivity-using-powertoys-day-3-registry-preview/The Registry Preview tool lets you edit .reg files with a visual interface.Mon, 06 Jan 2025 18:32:00 GMThttps://blog.xingxinhe.com/2025/01/3-lines-of-code-convince-you-to-use-raii-in-cpp/https://blog.xingxinhe.com/2025/01/3-lines-of-code-convince-you-to-use-raii-in-cpp/C++ memory management can be tricky without RAII. But I will try to convince you to use RAII within 3 lines of code.Sat, 04 Jan 2025 22:24:00 GMThttps://blog.xingxinhe.com/2025/01/what-we-can-learn-from-von-neumann-strength-and-struggle/https://blog.xingxinhe.com/2025/01/what-we-can-learn-from-von-neumann-strength-and-struggle/John von Neumann's life lessons on balancing depth and breadth in his work.Fri, 03 Jan 2025 00:02:00 GMThttps://blog.xingxinhe.com/2025/01/how-to-derive-the-perspective-matrix-with-2-observations/https://blog.xingxinhe.com/2025/01/how-to-derive-the-perspective-matrix-with-2-observations/Explains how to derive the matrix in computer graphics using two invariant points, one on the near plane and another on the far plane.Thu, 02 Jan 2025 20:40:00 GMThttps://blog.xingxinhe.com/2024/12/boost-productivity-using-powertoys-day-2-screen-ruler/https://blog.xingxinhe.com/2024/12/boost-productivity-using-powertoys-day-2-screen-ruler/The Screen Ruler is a measurement tool that you can measure the elements on your screen with pixels / centimeters / millimeters.Thu, 26 Dec 2024 09:50:00 GMThttps://blog.xingxinhe.com/2024/12/boost-productivity-using-powertoys-day-1-shortcut-guide/https://blog.xingxinhe.com/2024/12/boost-productivity-using-powertoys-day-1-shortcut-guide/The Shortcut Guide is simply showing you what shortcuts are there starting with the Windows key ⊞. That's it. Simple and straight forward.Wed, 25 Dec 2024 15:19:00 GMThttps://blog.xingxinhe.com/2024/12/how-i-setup-my-obsidian-publish/https://blog.xingxinhe.com/2024/12/how-i-setup-my-obsidian-publish/A step by step instructions on how to setup.Tue, 24 Dec 2024 12:01:00 GMThttps://blog.xingxinhe.com/2024/12/when-you-see-403-immediately-think-of-these/https://blog.xingxinhe.com/2024/12/when-you-see-403-immediately-think-of-these/Most of the time when I am dealing with cloud solution, the 403 is the most frequent code I encounter...Mon, 23 Dec 2024 00:00:00 GMThttps://blog.xingxinhe.com/2025/01/how-i-decide-how-much-coffee-to-drink-a-day/https://blog.xingxinhe.com/2025/01/how-i-decide-how-much-coffee-to-drink-a-day/Choosing the right amount of caffeine is key to staying focused without overdoing it.Sat, 21 Dec 2024 14:08:00 GMThttps://blog.xingxinhe.com/2024/12/play-with-azure-synapse-analytics/https://blog.xingxinhe.com/2024/12/play-with-azure-synapse-analytics/Today, I am having fun following with this tutorial. It's with lot of fun playing these services.Sat, 14 Dec 2024 15:22:00 GMThttps://blog.xingxinhe.com/2024/12/use-the-limit-comparison-test-when-the-direct-comparison-test-is-not-applicable/https://blog.xingxinhe.com/2024/12/use-the-limit-comparison-test-when-the-direct-comparison-test-is-not-applicable/We start with the question that when should I use for improper integral? direct comparison test? or limit comparison test?Sat, 07 Dec 2024 18:41:00 GMThttps://blog.xingxinhe.com/2024/12/exploring-the-lru-algorithm-a-journey-into-cache-management/https://blog.xingxinhe.com/2024/12/exploring-the-lru-algorithm-a-journey-into-cache-management/In this exploration, we will delve into the mechanics of the LRU algorithm, using a concrete example to illustrate its operation and effectiveness.Sat, 07 Dec 2024 13:48:00 GMThttps://blog.xingxinhe.com/2024/12/how-to-concatenate-cpp-stdbitset/https://blog.xingxinhe.com/2024/12/how-to-concatenate-cpp-stdbitset/I have 2 std::bitsets [0][1][1] and [1][1][0][1]. I want to concatenate them into [0][1][1][1][1][0][1], which equals 61 in decimal.Tue, 03 Dec 2024 16:45:00 GMThttps://blog.xingxinhe.com/2024/11/the-pitfall-using-cpp-stdmin-and-stdminelement-a-cautinary-tale/https://blog.xingxinhe.com/2024/11/the-pitfall-using-cpp-stdmin-and-stdminelement-a-cautinary-tale/The std::min is very different from std::min_element!!Sat, 30 Nov 2024 21:20:00 GMThttps://blog.xingxinhe.com/2023/12/understand-arc-length-parameterization-via-rhino-grasshopper/https://blog.xingxinhe.com/2023/12/understand-arc-length-parameterization-via-rhino-grasshopper/I will attempt to explain this fascinating concept in a more vivid way using Rhino & Grasshopper.Sun, 31 Dec 2023 19:28:00 GMThttps://blog.xingxinhe.com/2023/12/2-professors-suggest-me-learning-by-doing/https://blog.xingxinhe.com/2023/12/2-professors-suggest-me-learning-by-doing/I've found that people from different fields support the idea of learning-by-doing.Fri, 15 Dec 2023 12:52:00 GMThttps://blog.xingxinhe.com/2023/11/my-friend-li-lei-decides-to-learn-artificial-intelligence/https://blog.xingxinhe.com/2023/11/my-friend-li-lei-decides-to-learn-artificial-intelligence/My friend Li Lei, a full-stack developer in Shanghai, did not major in computer science or mathematics for his undergraduate or master's degrees.Tue, 14 Nov 2023 23:24:00 GMThttps://blog.xingxinhe.com/2023/02/will-chatgpt-express-itself-with-emojis/https://blog.xingxinhe.com/2023/02/will-chatgpt-express-itself-with-emojis/If you've watched the American sci-fi TV series "Pantheon", you might remember a scene...Sat, 18 Feb 2023 23:31:00 GMThttps://blog.xingxinhe.com/2022/02/what-is-rhinoinside-explain-via-a-console-program/https://blog.xingxinhe.com/2022/02/what-is-rhinoinside-explain-via-a-console-program/This post will guide you through creating a Rhino console program from scratch. 💻Fri, 18 Feb 2022 00:53:00 GMThttps://blog.xingxinhe.com/2020/12/perspective-projection-my-first-lesson-towards-computer-graphics/https://blog.xingxinhe.com/2020/12/perspective-projection-my-first-lesson-towards-computer-graphics/As an architect, I have never thought about the principle behind when I was modeling in Rhino, SketchUp, Revit, etc...Wed, 23 Dec 2020 11:19:00 GMT