Re: ode "Mass" and "Jacobian" options

[Bill Greene]

The matrix must be square. In matlab, it can be complex but since octave depends on

sundials there doesn't appear to be any easy way to support complex ODEs. So the octave

versions should  disallow complex.

On Tue, Feb 4, 2020 at 7:10 PM Rik <address@hidden> wrote:

On 02/04/2020 03:54 PM, Bill Greene wrote:

What is an "N-D array"? Do you mean 3 or more dimensions?

Yes, that is the general usage of N-D array in Octave documentation.

As far as I am aware, the Mass matrix must be a 2-D full or sparse matrix.

Okay.  Is the matrix also required to be real and square? 

Thanks,
Rik

On Tue, Feb 4, 2020 at 5:26 PM Rik <address@hidden> wrote:

The ode solver options "Mass" and "Jacobian" can be either a function
handle or a matrix according to odeset().  If it is a matrix, does that
mean a numeric 2-D matrix or just a numeric N-D array?

The input validation for ode15i and ode15s has to be re-done because of a
change in the behavior of str2func, and I'm taking the opportunity to
improve it.

Thanks,
Rik