Exception for Toniolo and Linder, Equation (13)

Math

\[\sqrt{\left(\left(2 \cdot n\right) \cdot U\right) \cdot \left(\left(t - 2 \cdot \frac{\ell \cdot \ell}{Om}\right) - \left(n \cdot {\left(\frac{\ell}{Om}\right)}^{2}\right) \cdot \left(U - U*\right)\right)}\]

C

double f(double n, double U, double t, double l, double Om, double U_) {
        double r7985 = 2.0;
        double r7986 = n;
        double r7987 = r7985 * r7986;
        double r7988 = U;
        double r7989 = r7987 * r7988;
        double r7990 = t;
        double r7991 = l;
        double r7992 = r7991 * r7991;
        double r7993 = Om;
        double r7994 = r7992 / r7993;
        double r7995 = r7985 * r7994;
        double r7996 = r7990 - r7995;
        double r7997 = r7991 / r7993;
        double r7998 = pow(r7997, r7985);
        double r7999 = r7986 * r7998;
        double r8000 = U_;
        double r8001 = r7988 - r8000;
        double r8002 = r7999 * r8001;
        double r8003 = r7996 - r8002;
        double r8004 = r7989 * r8003;
        double r8005 = sqrt(r8004);
        return r8005;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019191 +o rules:numerics
(FPCore (n U t l Om U*)
  :name "Toniolo and Linder, Equation (13)"
  (sqrt (* (* (* 2.0 n) U) (- (- t (* 2.0 (/ (* l l) Om))) (* (* n (pow (/ l Om) 2.0)) (- U U*))))))

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