Perform reaction diffusion simulation on grid

by Gwyn Milcote

HTML

reaction diff.

<div id='test'></div>

JavaScript

/**


This function performs reaction diffusion simulation on a 2D grid.



@param {number[][]} grid - A 2D array representing the grid to perform the simulation on.


@param {number} dA - The diffusion rate of chemical A.


@param {number} dB - The diffusion rate of chemical B.


@param {number} feed - The feed rate of chemical A.


@param {number} kill - The kill rate of chemical B.


@param {number} dt - The time step for the simulation.


@param {number} iterations - The number of iterations to perform.



@returns {number[][]} A 2D array representing the updated grid after the simulation.
 */
function reactionDiffusion(grid, dA, dB, feed, kill, dt, iterations) {
  try {
    // Check if grid is a 2D array
    if (!Array.isArray(grid) || !Array.isArray(grid[0])) {
      throw new TypeError('Grid must be a 2D array');
    }
// Get the dimensions of the grid
const rows = grid.length;
const cols = grid[0].length;
// Create a copy of the grid to store the updated values
const newGrid = new Array(rows).fill().map(() => new Array(cols).fill());
// Perform the simulation for the specified number of iterations
for (let i = 0; i < iterations; i++) {
  // Loop through each cell in the grid
  for (let row = 0; row < rows; row++) {
    for (let col = 0; col < cols; col++) {
      // Get the values of the neighboring cells
      const left = col === 0 ? grid[row][cols - 1] : grid[row][col - 1];
      const right = col === cols - 1 ? grid[row][0] : grid[row][col + 1];
      const top = row === 0 ? grid[rows - 1][col] : grid[row - 1][col];
      const bottom = row === rows - 1 ? grid[0][col] : grid[row + 1][col];
  // Calculate the Laplacian of chemical A and B
  const lapA = (left + right + top + bottom - 4 * grid[row][col]);
  const lapB = (left + right + top + bottom - 4 * grid[row][col + 1]);

  // Calculate the new values of chemical A and B
  const a = grid[row][col];
  const b = grid[row][col + 1];
  const...