math2001

I wanted to learn how to do isometric rendering:

And I wanted to learn about A* (how do you get out of a maze, quickly)

I wanted to learn how to make multiplayer games (running over TCP):

math2001

Can a function z = f(x, y) have an inverse (x, y, z in R)

Surface points with distinct heights

If we think of z = F(x, y) as describing a surface, then this question translates to asking:

Can one find a continuous surface for which every distinct point on that surface has a unique height

math2001

with(LinearAlgebra)

a := <vector A>
b := <vector B>

solve(Equate(a, b))

math2001

Keybase proof

I hereby claim:

• I am math2001 on github.
• I am math2001 (https://keybase.io/math2001) on keybase.
• I have a public key ASCzjxjUj_-ujbKB9g5mjtFSR3vYtbkUTpa1GYbcV1AWJQo

To claim this, I am signing this object:

math2001

# We are going to use an analogy of building houses to understand OOP.

# A class is like the plan/design of the house. It's the theory, nothing concrete.
# Our house has different properties (such as the colour, the number of doors, etc), these are called attributes.
# Our house has different behaviours (such as starting the alarm, locking every doors, etc), these are called methods.

# An instance, however, is the real thing. From one plan, one design, one *class*, we can make as many actual houses as we like
# And we can change them. For example, one house (an instance), might have 2 doors, where as an other one might have 4 doors.
# But they still have the same plan

math2001

#! /usr/bin/sh
trap 'exit' SIGINT

for i in `seq 254`; do
    (ping 192.168.1.$i -c 1 -w 1 > /dev/null && echo 192.168.1.$i)&
done
wait

math2001

You can build a client in Python if you feel like it, but you might as well just use telnet:

$ telnet localhost 9877

math2001

document.cookie = "cookie=yumi;path=/"

math2001

var copyToClipboard = (function () {

    const textarea = document.createElement('textarea')
    // hide the textarea (since we can't use display: none, it's a bit long)
    textarea.style.opacity = 0
    textarea.style.width = 0
    textarea.style.height = 0
    textarea.style.position = 'absolute'
    textarea.style.bottom = '-100%'
    textarea.style.left = '-100%'

math2001

How do I add a path to your PATH environment variable on Windows?

1. Open the Control Panel.
2. Go to System and Security.
3. Go to System.
4. On the left, click on Advanced system settings (you need to have administrator privileges to do so)
5. Click on Environment Variables
6. Click on Path in the top box
7. Click Edit