[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: ode45 inclusion into core
From: |
Carlo De Falco |
Subject: |
Re: ode45 inclusion into core |
Date: |
Tue, 6 Oct 2015 15:33:39 +0000 |
On 6 Oct 2015, at 09:44, Richard Crozier <address@hidden> wrote:
> There is an undocumented feature of matlab's ode45 and most of the other ode*
> functions. They pass any additional arguments to ode45 after the 'options'
> arguments to the ode evaluation function, crossing detection function and
> output function. This is really useful and would be nice to have in Octave's
> versions too if it's not present.
This feature is present in the current version of ode45 in Octave, but I think
it was deprecated in Matlab.
The recommended way of achieving the same result is via a anonymous function,
i.e., supposing you have
function r = resfun (t, y, z)
r = t + y + z;
endfunction
instead of using the deprecated approach of passing the extra parameter z as an
additional input to de45:
ode45 (@resfun, tspan, y0, options, z)
you use an anonymous function to bind the value of z
ode45 (@(t, y) resfun(t, y, z), tspan, y0, options)
this techinique is reccomended in Matlab [1, 2], but the old behaviour, now
deprecated and undocumented, is still
working and I think is kept for bacward compatibility.
In the Octave implementation I was considering removing this feature as it make
the code much more complicated.
> Richard
c.
[1] http://it.mathworks.com/help/matlab/ref/ode45.html "Parameterizing
Functions explains how to provide additional parameters to the function fun, if
necessary."
[2] http://it.mathworks.com/help/matlab/math/parameterizing-functions.html
- Re: ode45 inclusion into core, Rik, 2015/10/08
- ode45 inclusion into core, Rik, 2015/10/08
- Re: ode45 inclusion into core, Jacopo Corno, 2015/10/08
- Re: ode45 inclusion into core, siko1056, 2015/10/08
- Re: ode45 inclusion into core, Richard Crozier, 2015/10/08
- Re: ode45 inclusion into core,
Carlo De Falco <=
- Re: ode45 inclusion into core, Richard Crozier, 2015/10/08
- Re: ode45 inclusion into core, Juan Pablo Carbajal, 2015/10/08
- Re: ode45 inclusion into core, Carlo De Falco, 2015/10/08
- Re: ode45 inclusion into core, Olaf Till, 2015/10/08
- Re: ode45 inclusion into core, Richard Crozier, 2015/10/08
- Re: ode45 inclusion into core, Olaf Till, 2015/10/08
- Re: ode45 inclusion into core, Richard Crozier, 2015/10/08