Specification

\[\begin{array}{l} \\ \frac{2}{e^{x} + e^{-x}} \end{array} \]

(FPCore (x) :precision binary64 (/ 2.0 (+ (exp x) (exp (- x)))))

double code(double x) {
	return 2.0 / (exp(x) + exp(-x));
}

real(8) function code(x)
    real(8), intent (in) :: x
    code = 2.0d0 / (exp(x) + exp(-x))
end function

public static double code(double x) {
	return 2.0 / (Math.exp(x) + Math.exp(-x));
}

def code(x):
	return 2.0 / (math.exp(x) + math.exp(-x))

function code(x)
	return Float64(2.0 / Float64(exp(x) + exp(Float64(-x))))
end

function tmp = code(x)
	tmp = 2.0 / (exp(x) + exp(-x));
end

code[x_] := N[(2.0 / N[(N[Exp[x], $MachinePrecision] + N[Exp[(-x)], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]

\begin{array}{l}

\\
\frac{2}{e^{x} + e^{-x}}
\end{array}

Reproduce

herbie shell --seed 2024005 
(FPCore (x)
  :name "Hyperbolic secant"
  :precision binary64
  (/ 2.0 (+ (exp x) (exp (- x)))))

Please file a bug report with this information.

repr->cost: arity mismatch; the expected number of arguments does not match the given number expected: 2 given: 1		L	C
loop	.../private/map.rkt	54	19
f490	.../match/compiler.rkt	548	40
make-alt-table	/home/nightlies/herbie/platforms/src/core/alt-table.rkt	40	0
(unnamed)	/usr/share/racket/collects/racket/contract/private/arrow-val-first.rkt	486	18
initialize-alt-table!	/home/nightlies/herbie/platforms/src/mainloop.rkt	316	0
mutate!	/home/nightlies/herbie/platforms/src/mainloop.rkt	352	0
run-improve!	/home/nightlies/herbie/platforms/src/mainloop.rkt	338	0
get-alternatives/report	/home/nightlies/herbie/platforms/src/sandbox.rkt	169	0
(unnamed)	/home/nightlies/herbie/platforms/src/sandbox.rkt	262	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