Re: [Boost-bugs] [Boost C++ Libraries] #10946: Add dt to system arguments

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #10946: Add dt to system arguments
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2015-01-29 21:06:04

#10946: Add dt to system arguments
--------------------------------+---------------------
  Reporter:  ilja.j.honkonen@…  |      Owner:  karsten
      Type:  Feature Requests   |     Status:  new
 Milestone:  To Be Determined   |  Component:  odeint
   Version:  Boost 1.57.0       |   Severity:  Problem
Resolution:                     |   Keywords:
--------------------------------+---------------------

Comment (by karsten):

 This sound interesting.

 I had a look at the paper you mention. If one implements a solver as
 described in Eq 25 and Eq 26 one could easily pass the step size to the
 system function. The requirements of such solver on the system function is
 then different than for the usual RK steppers and it might require a
 system in the form sys( x , dxdt , t , dt ).

 But I am not sure if it make sense to add dt to the Runge-Kutta steppers.
 For example, for the classical RK4, one time step is calculated from 4
 individual Euler steps each with a different step size. Do you think it is
 possible to use your suggestion with Runge Kutta methods?

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/10946#comment:1>
Boost C++ Libraries <http://www.boost.org/>
Boost provides free peer-reviewed portable C++ source libraries.