Error!The Optimal value (cvx_optval) is NaN

[Mark_L_Stone]

What are the reasons for this situation? Can you help me

I have many posts. Crude, unsafeguarded (no line search or trust region) SCA is very unreliable, and often fails when applied to new problems. It may not converge to anything, and if it does, it may not be a global or even local optimum. You may be better off using an existing non-convex solver (for instance, under YALMIP) than writing your own SCA.

Sqlp stop: dual problem is suspected of being infeasible in next iteration

As you can read in my posts on this forum, SCA can be unreliable, and may not converge to anything. That can include problems becoming infeasible. Read my advice earlier in this thread.

For alternate optimization, I used SCA to deal with the non-convex parts of the constraint terms. The final result satisfies the constraint, but does not match the target at all (least squares problem)