\[\left(x \cdot \log y + z \cdot \log \left(1 - y\right)\right) - t\]

\left(x \cdot \log y + z \cdot \log \left(1 - y\right)\right) - t

double f(double x, double y, double z, double t) {
        double r8546 = x;
        double r8547 = y;
        double r8548 = log(r8547);
        double r8549 = r8546 * r8548;
        double r8550 = z;
        double r8551 = 1.0;
        double r8552 = r8551 - r8547;
        double r8553 = log(r8552);
        double r8554 = r8550 * r8553;
        double r8555 = r8549 + r8554;
        double r8556 = t;
        double r8557 = r8555 - r8556;
        return r8557;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019191 
(FPCore (x y z t)
  :name "Numeric.SpecFunctions:invIncompleteBetaWorker from math-functions-0.1.5.2, B"

  :herbie-target
  (- (* (- z) (+ (+ (* 0.5 (* y y)) y) (* (/ 0.3333333333333333 (* 1.0 (* 1.0 1.0))) (* y (* y y))))) (- t (* x (log y))))

  (- (+ (* x (log y)) (* z (log (- 1.0 y)))) t))

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