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Fwd: Re: can ode23s be used with fixed time step?


From: Terry Duell
Subject: Fwd: Re: can ode23s be used with fixed time step?
Date: Sat, 23 Feb 2013 13:43:22 +1100
User-agent: Opera Mail/12.14 (Linux)

In my reply to Carlo, I omitted to cc the list, sorry.

------- Forwarded message -------
From: "Terry Duell" <address@hidden>
To: "c." <address@hidden>
Cc:
Subject: Re: can ode23s be used with fixed time step?
Date: Sat, 23 Feb 2013 13:28:51 +1100

Hello Carlo,

On Sat, 23 Feb 2013 13:17:31 +1100, c. <address@hidden> wrote:


On 23 Feb 2013, at 00:11, Terry Duell <address@hidden> wrote:

[snip]

It appears that 'odeset' only accepts a 'MaxStep' argument.
Is there a way of using 'ode23s' with fixed time step?

[snip]

Rather than using a fixed stepsize I'd recomend solving with adaptive step and then interpolatang on a uniform grid, e.g.:

[snip]


that said, if you really want to, then you can change the following lines in ode23s:

[snip]

and then set Initialtep and MaxStep to the same value to maintain a canstant step size, e.g.


That is very helpful, thank you.

Cheers,


--
Regards,
Terry Duell


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