function aldousBroder(grid, rGen) {
const visited = Array.from(Array(grid.nRows), (_) =>
Array(grid.nCols).fill(false)
);
let numVisited = 0;
let c = randSample([...grid.eachCell()], rGen);
while (numVisited < grid.nRows * grid.nCols) {
const c2 = randSample(c.adjacent.filter(Boolean), rGen);
if (!visited[c2.row][c2.col]) {
c.link(c2);
visited[c2.row][c2.col] = true;
numVisited++;
}
c = c2;
}
return grid;
}
function wilson(grid, rGen) {
const start = grid.randomCell(rGen);
const visited = Array.from(Array(grid.nRows), (_) =>
Array(grid.nCols).fill(false)
);
visited[start.row][start.col] = true;
let unvisited = [...grid.eachCell()].filter(
(cell) => !visited[cell.row][cell.col]
);
while (unvisited.length > 0) {
// Start a loop-erased random walk from a random unvisited cell until we hit a visited one.
let cell = randSample(unvisited, rGen);
let path = [cell];
while (!visited[cell.row][cell.col]) {
cell = randSample(cell.adjacent.filter(Boolean), rGen);
const indexInPath = path.findIndex(
(p) => p.row === cell.row && p.col === cell.col
);
if (indexInPath === -1) {
path.push(cell);
} else {
path = path.slice(0, indexInPath + 1); // We've self-intersected, so erase the loop.
}
}
// Now that we have a valid path, connect cells and update visited/unvisited lists
for (let i = 0; i < path.length - 1; i++) {
path[i].link(path[i + 1]);
visited[path[i].row][path[i].col] = true;
}
unvisited = unvisited.filter((cell) => !visited[cell.row][cell.col]);
}
return grid;
}
function randomMST(grid, rGen) {
const g = toGraph(grid);
for (const e of g.serialize().links) {
g.setEdgeWeight(e.source, e.target, randInt(1000, rGen));
}
return g.mst();
}
One platform to build and deploy the best data apps
Experiment and prototype by building visualizations in live JavaScript notebooks. Collaborate with your team and decide which concepts to build out.
Use Observable Framework to build data apps locally. Use data loaders to build in any language or library, including Python, SQL, and R.
Seamlessly deploy to Observable. Test before you ship, use automatic deploy-on-commit, and ensure your projects are always up-to-date.