tycho-solver/dist/utils/rng.js

Evolutionary computation and optimization library

// Simple seeded RNG (LCG) for reproducible runs
export class RNG {
    state;
    constructor(seed) {
        if (seed === undefined || seed === null) {
            // derive seed from current time
            seed = Date.now() & 0xffffffff;
        }
        this.state = seed >>> 0;
    }
    // returns float in [0,1)
    random() {
        // constants from Numerical Recipes
        this.state = (1664525 * this.state + 1013904223) >>> 0;
        return (this.state & 0xffffffff) / 0x100000000;
    }
    // returns integer in [0, n)
    int(n) {
        return Math.floor(this.random() * n);
    }
}
export function seededRandom(seed) {
    return new RNG(seed);
}
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