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Feature #347

C5 cannot compute derivative of a ratfn

Added by John Abbott almost 11 years ago. Updated about 10 years ago.

Status:
Closed
Priority:
Normal
Assignee:
John Abbott
Category:
CoCoA-5 function: new
Target version:
CoCoA-5.0.3
Start date:
02 May 2013
Due date:
% Done:

100%

Estimated time:
Spent time:
3.50 h

Description

Add formal derivative of a rat fn -- might also be missing from CoCoALib?

History

#1 Updated by John Abbott almost 11 years ago

  • Category set to CoCoA-5 function: new
  • Status changed from New to Feedback
  • Assignee set to John Abbott
  • Target version set to CoCoA-5.0.3

Modified at CoCoALib level: FractionField now has a myDeriv mem fn (which expects the base ring to be a PolyRing).

Note that the main "dispatch" fn deriv is actually in PolyRing.C; it checks whether the ring is a FractionField and, if so, delegates the work to FrF.

Still to do: add tests, check documentation.

#2 Updated by John Abbott almost 11 years ago

  • % Done changed from 0 to 90

Added (v. simple) test and updated doc.

#3 Updated by Anna Maria Bigatti almost 11 years ago

added example in manual.

#4 Updated by John Abbott about 10 years ago

  • Status changed from Feedback to Closed
  • % Done changed from 90 to 100

This has been in feedback for 9 months without any problems, so closing.

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