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instructions.md

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Something something dot matrix display.

1. Define the Exercism logo matrix E

[
    0 0 1 1 0 0 0 0 0 0 0 0 0 0 1 1 0 0;
    0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0;
    0 1 0 0 0 1 0 0 0 0 0 0 1 0 0 0 1 0;
    0 1 0 0 1 0 1 0 0 0 0 1 0 1 0 0 1 0;
    0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0;
    1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1;
    0 1 0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0;
    0 1 0 0 0 0 0 1 0 0 1 0 0 0 0 0 1 0;
    0 1 0 0 0 0 0 0 1 1 0 0 0 0 0 0 1 0;
    0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0;
    0 0 1 1 0 0 0 0 0 0 0 0 0 0 1 1 0 0;
]

If you "render" it, it looks like this:

  XX          XX
 X              X
 X   X      X   X
 X  X X    X X  X
 X              X
X                X
 X    X    X    X
 X     X  X     X
 X      XX      X
 X              X
  XX          XX

2. Define a function that makes the logo frown

Define frown! and frown functions that take the Exercism logo matrix and change the smiling mouth to a frowning mouth:

  XX          XX
 X              X
 X   X      X   X
 X  X X    X X  X
 X              X
X                X
 X      XX      X
 X     X  X     X
 X    X    X    X
 X              X
  XX          XX

3. Rotate the Exercism logo matrix by 90° to the left / 270° to the right / $-\frac{π}{2}$

Define a method rot270.

In this particular case we don't care about the type of the matrix, so we can transpose it.

4. Rotate the Exercism logo matrix by 90° to the right / $+\frac{π}{2}$

5. Put together a stickerwall

Define stickerwall.

  XX          XX   X   XX          XX
 X              X  X  X              X
 X   X      X   X  X  X   X      X   X
 X  X X    X X  X  X  X  X X    X X  X
 X              X  X  X              X
X                X X X                X
 X    X    X    X  X  X      XX      X
 X     X  X     X  X  X     X  X     X
 X      XX      X  X  X    X    X    X
 X              X  X  X              X
  XX          XX   X   XX          XX
                   X
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
                   X
  XX          XX   X   XX          XX
 X              X  X  X              X
 X   X      X   X  X  X   X      X   X
 X  X X    X X  X  X  X  X X    X X  X
 X              X  X  X              X
X                X X X                X
 X      XX      X  X  X    X    X    X
 X     X  X     X  X  X     X  X     X
 X    X    X    X  X  X      XX      X
 X              X  X  X              X
  XX          XX   X   XX          XX