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The <input type="number"> is so evil. I thought that entering 1e309 will have its value return 1e309 and that converting it to a number will give me infinity. Nope, it will return an empty string, and converting it to a number gets me zero. Note that 1e309 IS A VALID FLOATING-POINT NUMBER according to the #HTML standard.
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Articles
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New website for MOIS Project (club)
I have built a website for our club called MOIS Project. It is a club related to music and band.
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My activities in 2020 JDFZ Summer Session
JDFZ is hosting a summer session, where lectures covering a wide range of topics are held. Come and see what are my activities during this event.
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New website for Little Turings (club)
I, the president and one of the founders of Little Turings, created a website to distribute information about it. The website is bilingual (Chinese and English).
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Drawing a heart using Joukowsky transformation
Joukowsky transformation of a circle centered at of radius is a curve resembling a heart.
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Generalization of Euler–Lagrange equation
We may generalize Euler–Lagrange equation to higher dimensional optimization problems: find a function defined inside a region to extremize a functional defined as an integral over that region, with the constraint that the value of the function is fixed on the boundary of the region.
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View of the world (physically rather than philosophically)
The view of the world… Physically! In this article, I tried to use mathematical language to describe models of the physical world. A view of the world should include: a space (actually spacetime) with some mathematical structure on it (whose points are events in the world), a symmetry principle describing the symmetry of the world, and a motion law to describe the physics and dynamics of the world. This article proposed models for Galilean, Einsteinian, and even Aristotelian worlds. Can you come up with even other worlds?
- Categories: physics
- Tags: imagination, long paper
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Simulating a mechanical system using rpg_core.js
Continuing my last work of simulating a mechanical system using RGSS3, I made a new version using rpg_core.js, the game scripting system shipped with RPG Maker MV. This version is live on web!
- Categories: physics
- Tags: javascript, rgss, hamiltonian, calculus, ode, web, fourier transform
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Simulating a mechanical system using RGSS3
Hamiltonian mechanics gives us a good way to simulate mechanical systems as long as we can get its Hamiltonian and its initial conditions. I implemented this simulation in RGSS3, the game scripting system shipped with RPG Maker VX Ace.
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Writing a DSL with commands split by space
DSL means domain-specific language. Ruby is a powerful script language in terms of building DSLs (as sublanguages of Ruby). In this article, I implemented my idea of a DSL with commands split by space. For example, you may just write a b cto run the commandsa,b, andcone after another! This trick is heavily applied in my project alda-rb. How do I achieve this?- Categories: programming
- Tags: ruby, meta programming
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Running Jekyll myself
I have got tired of letting GitHub Pages to run Jekyll for me. I cannot use custom plugins! I decide to run Jekyll myself and push the built result to GitHub repo. I wrote a script to do this.
- Categories: programming
- Tags: jekyll
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