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

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

double f(double k, double n) {
        double r8234 = 1.0;
        double r8235 = k;
        double r8236 = sqrt(r8235);
        double r8237 = r8234 / r8236;
        double r8238 = 2.0;
        double r8239 = atan2(1.0, 0.0);
        double r8240 = r8238 * r8239;
        double r8241 = n;
        double r8242 = r8240 * r8241;
        double r8243 = r8234 - r8235;
        double r8244 = r8243 / r8238;
        double r8245 = pow(r8242, r8244);
        double r8246 = r8237 * r8245;
        return r8246;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019191 
(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