Function shapeError

src/compute-engine/library/statistics.ts:857–862

(ce: ComputeEngine, name: string)

        const nonReal = nonRealUnivariateError(engine, 'Quartiles', xs);
        if (nonReal) return nonReal;
        // A datum with no real value leaves the sort with nothing to order by
        // (`hasValuelessDatum`), so all three quartiles are unknown — the same
        // triple an absent datum produces.
        if (hasValuelessDatum(xs))
          return engine.tuple(engine.NaN, engine.NaN, engine.NaN);
        if (!numericApproximation) {
          const vals = exactData(xs);
          if (vals) {
            const [q1, q2, q3] = exactQuartiles(engine, vals);