[Octave-bug-tracker] [bug #64008] Symbolic pkg v3.0.1: error in @simfun/int

[Guy Mélard]

URL:
  <https://savannah.gnu.org/bugs/?64008>

                 Summary: Symbolic pkg v3.0.1: error in @simfun/int
                   Group: GNU Octave
               Submitter: gmelard
               Submitted: Thu 06 Apr 2023 01:28:55 PM UTC
                Category: Octave Forge Package
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: 8.1.0
         Discussion Lock: Any
        Operating System: Microsoft Windows
           Fixed Release: None
         Planned Release: None


    _______________________________________________________

Follow-up Comments:


-------------------------------------------------------
Date: Thu 06 Apr 2023 01:28:55 PM UTC By: Guy Mélard <gmelard>
I tried to use the symbolic package to compute a lot of integrals of rational
functions and it gives always an incorrect result of 0. Here is a simple
example:

syms A funcz funcf z f
A(z) = poly2sym({1/2 1}, z)
vpasolve(A(z)==0,z)
funcz(z) = 1/((A(z)*A(1/z)))
funcf(f) = funcz(exp(sym(1i)*f))
int(funcf, f, [sym(0) 2*sym(pi)])

I have enclosed the script (TestCircularIntegral_v7.m), the output
(TestCircularIntegral_v7.txt), the Mathematica notebook
(TestCircularIntegral_v7.nb) and its PDF version (TestCircularIntegral_v7.pdf)
for the same problem that gives the correct value of 8pi/3. 
Thanks
Guy






    _______________________________________________________
File Attachments:


-------------------------------------------------------
Date: Thu 06 Apr 2023 01:28:55 PM UTC  Name: TestCircularIntegral_v7.m  Size:
192B   By: gmelard

<http://savannah.gnu.org/bugs/download.php?file_id=54568>
-------------------------------------------------------
Date: Thu 06 Apr 2023 01:28:55 PM UTC  Name: TestCircularIntegral_v7.txt 
Size: 795B   By: gmelard

<http://savannah.gnu.org/bugs/download.php?file_id=54569>
-------------------------------------------------------
Date: Thu 06 Apr 2023 01:28:55 PM UTC  Name: TestCircularIntegral_v7.nb  Size:
7KiB   By: gmelard

<http://savannah.gnu.org/bugs/download.php?file_id=54570>
-------------------------------------------------------
Date: Thu 06 Apr 2023 01:28:55 PM UTC  Name: TestCircularIntegral_v7.pdf 
Size: 45KiB   By: gmelard

<http://savannah.gnu.org/bugs/download.php?file_id=54571>

    _______________________________________________________

Reply to this item at:

  <https://savannah.gnu.org/bugs/?64008>

_______________________________________________
Message sent via Savannah
https://savannah.gnu.org/