whether automatic differentiation is slow in YALMIP, and how to improve it ?

[facat facat]

I guess YALMIP's impementation of automatic differentiation depends on Matlab's symbolic tool(MuPad in Matlab 2010a?). I find that it always takes a long long time before calling Ipopt. Is YALMIP doing  automatic differentiation before calling Ipopt. If this is true, how can I improve the speed because  automatic differentiation in Matlab is really slow.Thanks.

[Johan Löfberg]

YALMIP is in no sense related to the symbolic toolbox. If you experience performance issues,it is easiest if you send me some representative code

[facat facat]

Thank you for your fixing. Now YALMIP times faster than ever before.