special values of lesser hyperbolic functions
Even though Maxima can evaluate sech(0), Sage does this:
sage: cosh(0)
1
sage: sech(0)
sech(0)
It seems reasonable to fix this. Part of this is probably that sech is not a !GiNaC function.
Change History (14)
| Milestone: |
sage-5.11 →
sage-5.12
|
| Milestone: |
sage-6.1 →
sage-6.2
|
| Milestone: |
sage-6.2 →
sage-6.3
|
| Milestone: |
sage-6.3 →
sage-6.4
|
| Summary: |
Improve less-used hyperbolic functions →
special values of lesser hyperbolic functions
|
| Branch: |
→ u/rws/improve_less_used_hyperbolic_functions
|
| Authors: |
→ Ralf Stephan
|
| Commit: |
→ b1833cb5e3f2e204e4ec966e404a42835a82f418
|
| Status: |
new →
needs_review
|
| Status: |
needs_review →
needs_work
|
| Commit: |
b1833cb5e3f2e204e4ec966e404a42835a82f418 →
507dc57324d5cdada41940aa9d61120c0846f95a
|
| Status: |
needs_work →
needs_review
|
| Branch: |
u/rws/improve_less_used_hyperbolic_functions →
public/ticket/10074
|
| Commit: |
507dc57324d5cdada41940aa9d61120c0846f95a →
e064ff3a8cc50f28ccdac848c4eab688875d26e8
|
| Reviewers: |
→ Frédéric Chapoton
|
| Status: |
needs_review →
positive_review
|
| Branch: |
public/ticket/10074 →
e064ff3a8cc50f28ccdac848c4eab688875d26e8
|
| Resolution: |
→ fixed
|
| Status: |
positive_review →
closed
|
Is there a way of initializing a Ginac / Pynac function using a symbolic expression? It would be nice to be able to initialize
sechby calling simply:And the result would behave just like defining
sech(z) = 1/cosh(z)in Sage. Then we'd get (as in sage-5.0.beta9):Maybe this is naive...