Specification

\[0 \leq e \land e \leq 1\]

\[\begin{array}{l} \\ \frac{e \cdot \sin v}{1 + e \cdot \cos v} \end{array} \]

(FPCore (e v) :precision binary64 (/ (* e (sin v)) (+ 1.0 (* e (cos v)))))

double code(double e, double v) {
	return (e * sin(v)) / (1.0 + (e * cos(v)));
}

real(8) function code(e, v)
    real(8), intent (in) :: e
    real(8), intent (in) :: v
    code = (e * sin(v)) / (1.0d0 + (e * cos(v)))
end function

public static double code(double e, double v) {
	return (e * Math.sin(v)) / (1.0 + (e * Math.cos(v)));
}

def code(e, v):
	return (e * math.sin(v)) / (1.0 + (e * math.cos(v)))

function code(e, v)
	return Float64(Float64(e * sin(v)) / Float64(1.0 + Float64(e * cos(v))))
end

function tmp = code(e, v)
	tmp = (e * sin(v)) / (1.0 + (e * cos(v)));
end

code[e_, v_] := N[(N[(e * N[Sin[v], $MachinePrecision]), $MachinePrecision] / N[(1.0 + N[(e * N[Cos[v], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]

\begin{array}{l}

\\
\frac{e \cdot \sin v}{1 + e \cdot \cos v}
\end{array}

Reproduce

herbie shell --seed 2023271 
(FPCore (e v)
  :name "Trigonometry A"
  :precision binary64
  :pre (and (<= 0.0 e) (<= e 1.0))
  (/ (* e (sin v)) (+ 1.0 (* e (cos v)))))

Please file a bug report with this information.

Backtrace

length: contract violation expected: list? given: 8000		L	C
(unnamed)	/home/nightlies/herbie/arb-support/egg-herbie/main.rkt	111	2
egraph-run	/home/nightlies/herbie/main/src/core/egg-herbie.rkt	502	0
egraph-run-rules	/home/nightlies/herbie/main/src/core/egg-herbie.rkt	559	0
run-egg	/home/nightlies/herbie/main/src/core/egg-herbie.rkt	288	0
simplify-batch	/home/nightlies/herbie/main/src/core/simplify.rkt	15	0
(unnamed)	/usr/share/racket/collects/racket/contract/private/arrow-higher-order.rkt	379	33
find-preprocessing	/home/nightlies/herbie/main/src/preprocess.rkt	11	0
run-improve!	/home/nightlies/herbie/main/src/mainloop.rkt	325	0
get-alternatives/report	/home/nightlies/herbie/main/src/sandbox.rkt	149	0
(unnamed)	/home/nightlies/herbie/main/src/sandbox.rkt	245	6
(unnamed)	/usr/share/racket/pkgs/profile-lib/main.rkt	40	10
profile-thunk	/usr/share/racket/pkgs/profile-lib/main.rkt	9	0
(unnamed)	/usr/share/racket/collects/racket/engine.rkt	42	24