Exception for VandenBroeck and Keller, Equation (20)

• could not determine a ground truth

  1. f = 1251493620.6795008

Specification

Math

\[\begin{array}{l} \\ \begin{array}{l} t_0 := \frac{\pi}{4} \cdot f\\ t_1 := e^{t\_0}\\ t_2 := e^{-t\_0}\\ -\frac{1}{\frac{\pi}{4}} \cdot \log \left(\frac{t\_1 + t\_2}{t\_1 - t\_2}\right) \end{array} \end{array} \]

FPCore

(FPCore (f)
 :precision binary64
 (let* ((t_0 (* (/ PI 4.0) f)) (t_1 (exp t_0)) (t_2 (exp (- t_0))))
   (- (* (/ 1.0 (/ PI 4.0)) (log (/ (+ t_1 t_2) (- t_1 t_2)))))))

C

double code(double f) {
	double t_0 = (((double) M_PI) / 4.0) * f;
	double t_1 = exp(t_0);
	double t_2 = exp(-t_0);
	return -((1.0 / (((double) M_PI) / 4.0)) * log(((t_1 + t_2) / (t_1 - t_2))));
}

Java

public static double code(double f) {
	double t_0 = (Math.PI / 4.0) * f;
	double t_1 = Math.exp(t_0);
	double t_2 = Math.exp(-t_0);
	return -((1.0 / (Math.PI / 4.0)) * Math.log(((t_1 + t_2) / (t_1 - t_2))));
}

Python

def code(f):
	t_0 = (math.pi / 4.0) * f
	t_1 = math.exp(t_0)
	t_2 = math.exp(-t_0)
	return -((1.0 / (math.pi / 4.0)) * math.log(((t_1 + t_2) / (t_1 - t_2))))

Julia

function code(f)
	t_0 = Float64(Float64(pi / 4.0) * f)
	t_1 = exp(t_0)
	t_2 = exp(Float64(-t_0))
	return Float64(-Float64(Float64(1.0 / Float64(pi / 4.0)) * log(Float64(Float64(t_1 + t_2) / Float64(t_1 - t_2)))))
end

MATLAB

function tmp = code(f)
	t_0 = (pi / 4.0) * f;
	t_1 = exp(t_0);
	t_2 = exp(-t_0);
	tmp = -((1.0 / (pi / 4.0)) * log(((t_1 + t_2) / (t_1 - t_2))));
end

Wolfram

code[f_] := Block[{t$95$0 = N[(N[(Pi / 4.0), $MachinePrecision] * f), $MachinePrecision]}, Block[{t$95$1 = N[Exp[t$95$0], $MachinePrecision]}, Block[{t$95$2 = N[Exp[(-t$95$0)], $MachinePrecision]}, (-N[(N[(1.0 / N[(Pi / 4.0), $MachinePrecision]), $MachinePrecision] * N[Log[N[(N[(t$95$1 + t$95$2), $MachinePrecision] / N[(t$95$1 - t$95$2), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision])]]]

Reproduce

herbie shell --seed 2025126 
(FPCore (f)
  :name "VandenBroeck and Keller, Equation (20)"
  :precision binary64
  (- (* (/ 1.0 (/ PI 4.0)) (log (/ (+ (exp (* (/ PI 4.0) f)) (exp (- (* (/ PI 4.0) f)))) (- (exp (* (/ PI 4.0) f)) (exp (- (* (/ PI 4.0) f)))))))))

Please file a bug report with this information.

Backtrace

map: contract violation expected: list? given: "(let (v_0 (/.f64 PI.f64 4)) (let (v_1 (*.f64 v_0 $var0)) (let (v_2 (exp.f64 v_1)) (let (v_3 (exp.f64 (neg.f64 v_1))) (let (v_4 (/.f64 1 v_0)) (let (v_5 (log.f64 (/.f64 (+.f64 v_2 v_3) (-.f64 v_2 v_3))))...		L	C
gen-map	/usr/share/racket/collects/racket/private/map.rkt	257	2
add-derivations-to	/home/nightlies/herbie/artem-rules-updates/src/core/derivations.rkt	16	0
hash-ref!	/usr/share/racket/collects/racket/private/more-scheme.rkt	377	2
loop	.../private/map.rkt	40	19
alt-map	/home/nightlies/herbie/artem-rules-updates/src/utils/alternative.rkt	43	0
loop	.../private/map.rkt	40	19
alt-map	/home/nightlies/herbie/artem-rules-updates/src/utils/alternative.rkt	43	0
add-derivations	/home/nightlies/herbie/artem-rules-updates/src/core/derivations.rkt	30	0
extract!	/home/nightlies/herbie/artem-rules-updates/src/core/mainloop.rkt	60	0
run-improve!	/home/nightlies/herbie/artem-rules-updates/src/core/mainloop.rkt	40	0
get-alternatives	/home/nightlies/herbie/artem-rules-updates/src/api/sandbox.rkt	61	0
(unnamed)	/home/nightlies/herbie/artem-rules-updates/src/api/sandbox.rkt	191	6
(unnamed)	/usr/share/racket/pkgs/profile-lib/main.rkt	40	10
profile-thunk	/usr/share/racket/pkgs/profile-lib/main.rkt	9	0
in-engine	/home/nightlies/herbie/artem-rules-updates/src/api/sandbox.rkt	207	2
(unnamed)	/usr/share/racket/collects/racket/engine.rkt	42	24