[Ipopt] IpOpt code: Detereministic or Random across various runs?

[AliReza Khoshgoftar Monfared]

Thanks very much Tony,

It seems that the problem was exactly what you mentioned.
I was doing all consecutive runs of ipopt() in a for loop, but  there seems
to be a necessity to clear everything, except the initial point (which is
supposed to be the same across all runs)
Now I get exactly the same result across various runs with the same initial
points

Thanks
Alireza


On Mon, Dec 17, 2012 at 10:28 PM, Tony Kelman <kelman at berkeley.edu> wrote:

> Alireza,
>
> Something you should try is "clear functions" and/or "clear global"
> between invocations of Ipopt - there may be some internal state somewhere
> in the mex file or in your callback functions. There shouldn't be, but it's
> possible. Also check that your objective and constraint functions are
> returning dense vectors - in the patch that Stefan linked to, I only test
> for and fix the issue for the gradient function. I thought it would be much
> less likely for anyone to write objective or constraint functions that
> return sparse vectors, but that might also lead to similar strange behavior
> if it were the case.
>
> -Tony
>
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