An elementary monodimensional binary cellular automaton -90- with 49 white starting points -on the bottom line- [Un automate cellulaire binaire monodimensionnel élémentaire -90- avec 49 points de départ blancs -sur la ligne du bas-].

An elementary monodimensional binary automaton is a monodimensional set of cells. At time 't', each cell (with coordinate 'x') has a value 'CELL(x,t)' that equals either 0 (Black) or 1 (White) and has two neighbours (one at its left 'CELL(x-1,t)' and one at its right 'CELL(x+1,t)'). The points outside the picture (at left and at right) are assumed to be White. The time evolution of this set of cells is defined by means of rules.

This picture was computed using the following set of rules (B=Black, W=White):
```                    BBB = W
BBW = B
BWB = W
BWW = B
WBB = B
WBW = W
WWB = B
WWW = W
```
with, for example, "BWW = B" meaning:
```                    if ((CELL(x-1,t)==Black)&&(CELL(x,t)==White)&&(CELL(x+1,t)==White)) then CELL(x,t+1)=Black
```
This cellular automaton is called 90. As a matter of fact, when concatenating the right-hand sides of the preceding rules one obtains:
```                    --------   --------
WBWBBWBW = 10100101 = 01011010
```
and the binary number 01101110 equals the decimal number 90 (for 90=64+16+8+2). It can be displayed as the following cubes:
```                                    WWB=B---------------WWW=W                         B-------------------W
/.                  /|                         /.                  /|
/ .                 / |                        / .                 / |
/  .                /  |                       /  .                /  |
/   .               /   |                      /   .               /   |
/    .              /    |                     /    .              /    |
WBB=B---------------WBW=W   |                    B-------------------W     |
|     .             |     |                    |     .             |     |
|     .             |     |                    |     .             |     |
|     .             |     |                    |     .             |     |
|   BWB=W...........|...BWW=B                  |     W.............|.....B
|    .              |    /                     |    .              |    /
|   .               |   /                      |   .               |   /
^          |  .                |  /                       |  .                |  /
Y |  Z       | .                 | /                        | .                 | /
| /        |.                  |/                         |.                  |/
|/       BBB=W---------------BBW=B                        W-------------------B
O---->
X
```
the 'X', 'Y' and 'Z' axes being respectively the 'Right', 'Left' and 'Current' axes.

By the way there are 256 different such elementary monodimensional binary cellular automata (see and ).

The vertical axis is the time axis and the initial conditions are displayed on the bottom line.

[Plus d'informations à propos des automates cellulaires monodimensionnels -en français/in french-]

(CMAP28 WWW site: this page was created on 01/17/2003 and last updated on 08/22/2020 11:04:19 -CEST-)

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