[Octave-bug-tracker] [bug #56393] missing deval function for ode

[Carlo de Falco]

Follow-up Comment #8, bug #56393 (project octave):

rik, to add a bit more detail, according to the ode documentation, one of the
mandatory fields in the "sol" 
structure is the name of the solver used to compute the solution.
The other mandatory fields are only the integration points and solution values
"x" and "y".

In addition to the mandatory fields, extra data is stored in "sol". What data
is actually there does not seem to be documented and is probably dependent on
the solver used.

by running a test with ode45 on matlab 2014a, some fields that seem relevant
for the use by deval are

+varargin+
sol.extdata.{odefun,options,varargin}
-varargin-

which appear to be the original inputs to the call to ode45
and

+varargin+
sol.idata.f3d
-varargin-

which looks like the derivatives in each integration interval

all this is not documented so I don't think we should rely on the existence of
any of these fields nor copy the exact field names.



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