Exception for Migdal et al, Equation (51)

Math

\[\frac{1}{\sqrt{k}} \cdot {\left(\left(2 \cdot \pi\right) \cdot n\right)}^{\left(\frac{1 - k}{2}\right)}\]

C

double f(double k, double n) {
        double r8242 = 1.0;
        double r8243 = k;
        double r8244 = sqrt(r8243);
        double r8245 = r8242 / r8244;
        double r8246 = 2.0;
        double r8247 = atan2(1.0, 0.0);
        double r8248 = r8246 * r8247;
        double r8249 = n;
        double r8250 = r8248 * r8249;
        double r8251 = r8242 - r8243;
        double r8252 = r8251 / r8246;
        double r8253 = pow(r8250, r8252);
        double r8254 = r8245 * r8253;
        return r8254;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019191 +o rules:numerics
(FPCore (k n)
  :name "Migdal et al, Equation (51)"
  (* (/ 1.0 (sqrt k)) (pow (* (* 2.0 PI) n) (/ (- 1.0 k) 2.0))))

Backtrace

get-representation: Unknown representation #f		L	C
loop	/data/pavpan/nightlies/herbie/interface2/src/points.rkt	122	4
prepare-points	/data/pavpan/nightlies/herbie/interface2/src/points.rkt	146	0
setup-prog!34	/data/pavpan/nightlies/herbie/interface2/src/mainloop.rkt	67	0
run-improve43	/data/pavpan/nightlies/herbie/interface2/src/mainloop.rkt	339	0
(unnamed)	/opt/racket-7.0/collects/racket/private/more-scheme.rkt	261	28
run	/opt/racket-7.0/share/pkgs/profile-lib/main.rkt	39	2
profile-thunk16	/opt/racket-7.0/share/pkgs/profile-lib/main.rkt	9	0
(unnamed)	/opt/racket-7.0/collects/racket/private/more-scheme.rkt	261	28