Opened 4 years ago

Closed 4 years ago

#20098 closed defect (fixed)

doctest fix for: Re/Im(tanh) wrong formula

Reported by: rws Owned by:
Priority: major Milestone: sage-7.1
Component: symbolics Keywords:
Cc: behackl Merged in:
Authors: Ralf Stephan Reviewers: Marc Mezzarobba
Report Upstream: N/A Work issues:
Branch: 9eafdee (Commits) Commit: 9eafdee72e2d440a0ae9f7b47125a867a1524960
Dependencies: Stopgaps:

Description (last modified by rws)

In analogy to #19791: 

sage: tanh(1+2*I).n()
1.16673625724092 - 0.243458201185725*I
sage: tanh(1+2*I).real().n()
0.202053272732553
sage: tanh(1+2*I).imag().n()
-0.579697798322816
sage: tanh(x).real()
tanh(real_part(x))/(tan(imag_part(x))^2*tanh(real_part(x))^2 + 1)
sage: tanh(x).imag()
tan(imag_part(x))/(tan(imag_part(x))^2*tanh(real_part(x))^2 + 1)

See for example ​http://dlmf.nist.gov/4.35.E36

Will be fixed in Pynac-0.6.3 and should be doctested here.

Change History (6)

comment:1 Changed 4 years ago by rws

  • Description modified (diff)

comment:2 Changed 4 years ago by behackl

  • Cc behackl added

comment:3 Changed 4 years ago by rws

  • Branch set to u/rws/re_im_tanh__wrong_formula

comment:4 Changed 4 years ago by rws

  • Authors set to Ralf Stephan
  • Commit set to 9eafdee72e2d440a0ae9f7b47125a867a1524960
  • Status changed from new to needs_review
  • Summary changed from Re/Im(tanh) wrong formula to doctest fix for: Re/Im(tanh) wrong formula

New commits:

​9eafdee20098: doctest fix for Re/Im(tanh) wrong formula

comment:5 Changed 4 years ago by mmezzarobba

  • Reviewers set to Marc Mezzarobba
  • Status changed from needs_review to positive_review

comment:6 Changed 4 years ago by vbraun

  • Branch changed from u/rws/re_im_tanh__wrong_formula to 9eafdee72e2d440a0ae9f7b47125a867a1524960
  • Resolution set to fixed
  • Status changed from positive_review to closed
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