Average Error: 0.2 → 0.2
Time: 5.6s
Precision: 64
Internal Precision: 128
\[\frac{a}{-\cos^{-1} a}\]
↓
\[\frac{a}{-\cos^{-1} a}\]

Error

Bits error versus a

Try it out

Your Program's Arguments

Results

Enter valid numbers for all inputs

Derivation

  1. Initial program 0.2

    \[\frac{a}{-\cos^{-1} a}\]

  2. Final simplification0.2

    \[\leadsto \frac{a}{-\cos^{-1} a}\]

Reproduce

herbie shell --seed 2019007 
(FPCore (a)
  :name "Fuzzer 001"
  (/ a (- (acos a))))

Details

Time bar (total: 5.0s)Debug log

sample60.0ms

Algorithm
intervals

simplify2.0ms

Counts
1 → 1
Calls

1 calls. Slowest were:

2.0ms
(/ a (- (acos a)))

prune7.0ms

Pruning

1 alts after pruning (1 fresh and 0 done)

Merged error: 0.2b

localize15.0ms

Local error

Found 1 expressions with local error:

0.2b
(/ a (- (acos a)))

rewrite2.0ms

Algorithm
rewrite-expression-head
Counts
1 → 20
Calls

1 calls. Slowest were:

2.0ms
(/ a (- (acos a)))

series35.0ms

Counts
1 → 3
Calls

1 calls. Slowest were:

35.0ms
(/ a (- (acos a)))

simplify62.0ms

Counts
13 → 23
Calls

13 calls. Slowest were:

16.0ms
(* -1 (/ a (acos a)))
16.0ms
(* -1 (/ a (acos a)))
16.0ms
(* -1 (/ a (acos a)))

prune202.0ms

Pruning

6 alts after pruning (5 fresh and 1 done)

Merged error: 0.1b

localize10.0ms

Local error

Found 2 expressions with local error:

0.3b
(/ (- (acos a)) a)
0.3b
(/ 1 (/ (- (acos a)) a))

rewrite9.0ms

Algorithm
rewrite-expression-head
Counts
2 → 40
Calls

2 calls. Slowest were:

7.0ms
(/ (- (acos a)) a)
2.0ms
(/ 1 (/ (- (acos a)) a))

series48.0ms

Counts
2 → 6
Calls

2 calls. Slowest were:

24.0ms
(/ 1 (/ (- (acos a)) a))
24.0ms
(/ (- (acos a)) a)

simplify131.0ms

Counts
20 → 46
Calls

20 calls. Slowest were:

16.0ms
(* -1 (/ (acos a) a))
16.0ms
(* -1 (/ a (acos a)))
15.0ms
(* -1 (/ a (acos a)))

prune341.0ms

Pruning

9 alts after pruning (8 fresh and 1 done)

Merged error: 0.0b

localize16.0ms

Local error

Found 2 expressions with local error:

0.3b
(/ (acos a) a)
0.3b
(/ 1 (* -1 (/ (acos a) a)))

rewrite7.0ms

Algorithm
rewrite-expression-head
Counts
2 → 29
Calls

2 calls. Slowest were:

5.0ms
(/ (acos a) a)
2.0ms
(/ 1 (* -1 (/ (acos a) a)))

series47.0ms

Counts
2 → 6
Calls

2 calls. Slowest were:

24.0ms
(/ 1 (* -1 (/ (acos a) a)))
22.0ms
(/ (acos a) a)

simplify68.0ms

Counts
11 → 35
Calls

11 calls. Slowest were:

16.0ms
(* -1 (/ a (acos a)))
16.0ms
(* -1 (/ a (acos a)))
15.0ms
(* -1 (/ a (acos a)))

prune288.0ms

Pruning

10 alts after pruning (8 fresh and 2 done)

Merged error: 0.0b

localize15.0ms

Local error

Found 2 expressions with local error:

0.4b
(/ (/ 1 (- (acos a))) (/ 1 a))
0.0b
(/ 1 (- (acos a)))

rewrite11.0ms

Algorithm
rewrite-expression-head
Counts
2 → 62
Calls

2 calls. Slowest were:

7.0ms
(/ (/ 1 (- (acos a))) (/ 1 a))
2.0ms
(/ 1 (- (acos a)))

series38.0ms

Counts
2 → 6
Calls

2 calls. Slowest were:

27.0ms
(/ (/ 1 (- (acos a))) (/ 1 a))
12.0ms
(/ 1 (- (acos a)))

simplify1.7s

Counts
58 → 68
Calls

58 calls. Slowest were:

934.0ms
(/ (* (* (/ 1 (- (acos a))) (/ 1 (- (acos a)))) (/ 1 (- (acos a)))) (* (* (/ 1 a) (/ 1 a)) (/ 1 a)))
79.0ms
(/ (/ 1 (- (acos a))) (/ 1 a))
72.0ms
(/ (/ 1 (- (acos a))) (/ 1 a))

prune479.0ms

Pruning

8 alts after pruning (6 fresh and 2 done)

Merged error: 0.0b

regimes92.0ms

Accuracy

0% (0.2b remaining)

Error of 0.2b against oracle of 0.0b and baseline of 0.2b

bsearch0.0ms

end0.0ms

sample1.2s

Algorithm
intervals