Re: Problem with "NA"

[Juan Pablo Carbajal]

On Tue, Feb 19, 2013 at 7:05 AM, Terry Duell <address@hidden> wrote:
> Hello All,
> I am solving a number of simultaneous DEs.
> If I run the solution for a time t1 (say) I get quite respectable results
> for all my derivatives up to a time that is a bit short of t1. The results
> for the rest of the time are "NA". Thus far I can't see why this is
> happening.
> What sort of circumstances usually cause NAs ?
>
> Cheers,
> --
> Regards,
> Terry Duell
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NA is for missing data
http://www.gnu.org/software/octave/doc/interpreter/Missing-Data.html
bad oprations like division by zero and such should produce NaN.

Could you give us more details about your particular setup? What
solver are you using? Are you solving a nonlinear equation? Does the
solution exist for your initial conditions and your time window?