[Ipopt] continously run IPOPT,but different results

[cat fa]

        I used IPOPT to solve a NLP problem in Opti Toolbox. I found
that even I ran the same problem, results were always different,
although slightly . "different" meant that the optimal objective the
corresponding decision variables were different between each run.
Total iteration of each run varied.  I was sure there were no
stochastic parameters in my problem.
       I wonder if IPOPT implements any stochastic techniques?


Felix Du
Guangxi Univercity, China