Average Error: 43.2 → 43.2
Time: 26.5s
Precision: 64
Internal Precision: 1344
\[\Im(\left(\frac{\left(\left(e^{\left(xre + xim i\right)}\right) + \left(e^{\left(-\left(xre + xim i\right)\right)}\right)\right)}{\left(2 + 0 i\right)}\right))\]
↓
\[\Im(\left(\frac{\left(\left(e^{\left(-\left(xre + xim i\right)\right)}\right) + \left(e^{\left(xre + xim i\right)}\right)\right)}{\left(2 + 0 i\right)}\right))\]

Error

Bits error versus xre

Bits error versus xim

Derivation

  1. Initial program 43.2

    \[\Im(\left(\frac{\left(\left(e^{\left(xre + xim i\right)}\right) + \left(e^{\left(-\left(xre + xim i\right)\right)}\right)\right)}{\left(2 + 0 i\right)}\right))\]

  2. Final simplification43.2

    \[\leadsto \Im(\left(\frac{\left(\left(e^{\left(-\left(xre + xim i\right)\right)}\right) + \left(e^{\left(xre + xim i\right)}\right)\right)}{\left(2 + 0 i\right)}\right))\]

Reproduce

herbie shell --seed 2019018 
(FPCore (xre xim)
  :name "exp with complex power imaginary part (p55)"
  (im (/.c (+.c (exp.c (complex xre xim)) (exp.c (neg.c (complex xre xim)))) (complex 2 0))))

Details

Time bar (total: 23.1s)Debug log

sample749.0ms

Algorithm
halfpoints
Results

simplify19.0ms

Counts
1 → 1
Calls
1 calls:
Slowest
18.0ms
(im (/.c (+.c (exp.c (complex xre xim)) (exp.c (neg.c (complex xre xim)))) (complex 2 0)))

prune8.0ms

Pruning

1 alts after pruning (1 fresh and 0 done)

Merged error: 44.0b

localize174.0ms

Local error

Found 3 expressions with local error:

44.0b
(+.c (exp.c (complex xre xim)) (exp.c (neg.c (complex xre xim))))
0.0b
(exp.c (neg.c (complex xre xim)))
0.0b
(exp.c (complex xre xim))

rewrite6.0ms

Algorithm
rewrite-expression-head
Rules
1×+.c-commutative
Counts
3 → 1
Calls
3 calls:
Slowest
4.0ms
(+.c (exp.c (complex xre xim)) (exp.c (neg.c (complex xre xim))))
0.0ms
(exp.c (neg.c (complex xre xim)))
0.0ms
(exp.c (complex xre xim))

series0.0ms

Counts
3 → 3
Calls
3 calls:
Slowest
0.0ms
(+.c (exp.c (complex xre xim)) (exp.c (neg.c (complex xre xim))))
0.0ms
(exp.c (neg.c (complex xre xim)))
0.0ms
(exp.c (complex xre xim))

simplify15.0ms

Counts
3 → 4
Calls
3 calls:
Slowest
5.0ms
(im (/.c (+.c (exp.c (complex xre xim)) (exp.c (neg.c (complex xre xim)))) (complex 2 0)))
5.0ms
(im (/.c (+.c (exp.c (complex xre xim)) (exp.c (neg.c (complex xre xim)))) (complex 2 0)))
5.0ms
(im (/.c (+.c (exp.c (complex xre xim)) (exp.c (neg.c (complex xre xim)))) (complex 2 0)))

prune18.0ms

Pruning

1 alts after pruning (0 fresh and 1 done)

Merged error: 44.0b

end0.0ms

sample22.1s

Algorithm
halfpoints
Results