// Deterministic PRNG so every method multiplies identical inputs for a given size.
function mulberry32(seed: number) {
  let a = seed
  return () => {
    a |= 0
    a = (a + 0x6d2b79f5) | 0
    let t = Math.imul(a ^ (a >>> 15), 1 | a)
    t = (t + Math.imul(t ^ (t >>> 7), 61 | t)) ^ t
    return ((t ^ (t >>> 14)) >>> 0) / 4294967296
  }
}

export function generateMatrix(n: number, seed: number): Float64Array {
  const rand = mulberry32(seed)
  const m = new Float64Array(n * n)
  for (let i = 0; i < m.length; i++) m[i] = rand() - 0.5
  return m
}