Changes between Initial Version and Version 3 of Ticket #22090


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Timestamp:
01/04/17 15:14:37 (2 years ago)
Author:
rws
Comment:

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  • Ticket #22090

    • Property Status changed from new to needs_review
    • Property Commit changed from to 500332755b4187104f5ed47ec701a14d185d53d9
    • Property Branch changed from to u/rws/gosper_algorithm
    • Property Authors changed from to Ralf Stephan
  • Ticket #22090 – Description

    initial v3  
    11Pynac-0.7.3 will have Gosper's hypergeometric summation algorithm. The ticket will implement the interface and add an extensive test file. Later tickets may call it before delegating unsolved sums to Maxima.
     2
     3The test file has three tests marked as known bug. Each of them shows an area where the implementation will have to be approved:
     4 - expressions with algebraic coefficients (i.e. manipulations of polynomials over algebraic fields)
     5 - the final computation in Gosper's algorithm may result in `NaN` from `0*inf`,`0/0` or such. Here a limit computation will give the result. I didn't want to call Maxima from Pynac however.
     6 - enhancement of GiNaC's resultant implementation