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


task #12709: Submission of spectral variational integrator

Submitted by:  roberto porcu <robbb88>
Submitted on:  Wed Jun 19 15:50:07 2013  
Should Start On: Wed Jun 19 00:00:00 2013Should be Finished on: Fri Aug 30 22:00:00 2013
Category: Project ApprovalPriority: 5 - Normal
Status: CancelledPrivacy: Public
Percent Complete: 0%Assigned to: Assaf Gordon <agn>
Open/Closed: ClosedEffort: 0.00

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Tue Aug 12 00:10:19 2014, 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 Aug 24 10:42:23 2013, 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 Jun 19 15:50:07 2013, original submission:

A new project has been registered at Savannah
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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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Carbon-Copy List
  • -unavailable- added by agn (Posted a comment)
  • -unavailable- added by jllledo (Posted a comment)
  • -unavailable- added by robbb88 (Submitted the item)

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    Follow 5 latest changes.

    Date Changed By Updated Field Previous Value => Replaced By
    Tue Aug 12 00:10:19 2014agnStatusWait reply=>Cancelled
      Assigned toNone=>agn
    Sat Aug 24 10:42:23 2013jllledoShould be Finished onSat Jun 29 00:00:00 2013=>Fri Aug 30 22:00:00 2013
      StatusNone=>Wait reply

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