How to extract the dual variables of a SOCP problem using the command “dual”

[Changsen Feng]

Hello, Professor

I program an SOCP problem in Yalmip environment and solve it by Cplex. I intend to invoke the command "dual" to directly extract the values of dual variables

However, it shows "NAN" regardless of the linear constraints or the SOC constraint.

I want to confirm whether the command 'dual" is not applicable when facing the SOCP problem or other quadratic constrained problem.

Thank you very much

Best wishes

[Johan Löfberg]

https://groups.google.com/forum/#!topic/yalmip/jODtAcGXV0I

[Changsen Feng]

It works when using the operator cone.Thanks so much for you timely reply