taskSavannah Administration - Tasks: task #12709, Submission of spectral variational...


task #12709: Submission of spectral variational integrator

Submitted by:  roberto porcu <robbb88>
Submitted on:  Wed 19 Jun 2013 03:50:07 PM UTC  
Should Start On:  Wed 19 Jun 2013 12:00:00 AM UTC Should be Finished on:  Fri 30 Aug 2013 10:00:00 PM UTC
Category:  Project Approval Priority:  5 - Normal
Status:  Cancelled Privacy:  Public
Percent Complete:  0% Assigned to:  Assaf Gordon <agn>
Open/Closed:  Closed Effort:  0.00

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Tue 12 Aug 2014 12:10:19 AM UTC, comment #2:


There has been no response for a long while, so I am currently marking this item as "closed" without creating a project.

If you would still like to have your project hosted at Savannah, please register it again.


Assaf Gordon <agn>
Site AdministratorIn charge of this item.
Sat 24 Aug 2013 10:42:23 AM UTC, comment #1:


Thanks your for submission! I'm sorry about the delay. If you still want the hosting space, please answer on this comment (usual procedure if there has been some delay).

Joan Lledó <jllledo>
Wed 19 Jun 2013 03:50:07 PM UTC, original submission:

A new project has been registered at Savannah
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While this item will be useful to track the registration process, approving or discarding the registration must be done using the specific Group Administration page, accessible only to site administrators, effectively logged as site administrators (superuser):

Registration Details

  • Name: spectral variational integrator
  • System Name: specvarint
  • Type: non-GNU software and documentation
  • License: GNU General Public License v2 or later


This project is about Spectral Variational Integrators that are symplectic methods useful to solve Hamiltonian's equations. The code is written for Octave. These are spectral methods that use Legendre polynomials for the function basis and Gauss quadrature rule for the numerical quadrature.
The style used tends to reproduce Matlab ode45 style.
So the function @spectralvarint takes as inputs the functionHandle describing the Hamiltonian of the system, the vector of times, initial conditions (that are generalized coordinates and generalized momenta), and some options.
The output variables are a time vector and a matrix containing calculated coordinates and momenta. The program implements also a timestep-adaptivity on the basis of Richardson extrapolation.
This function could be included in odepkg or in a new package created specially for geometrical integrators.

Other Software Required:

octave odepkg

Tarball URL:


roberto porcu <robbb88>


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  • -email is unavailable- added by agn (Posted a comment)
  • -email is unavailable- added by jllledo (Posted a comment)
  • -email is unavailable- added by robbb88 (Submitted the item)

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    Follow 5 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2014-08-12 agn StatusWait reply => Cancelled
        Assigned toNone => agn
        Open/ClosedOpen => Closed
    2013-08-24 jllledo Should be Finished on2013-06-29 => 2013-08-30
        StatusNone => Wait reply

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