A fast algorithm for the computation of an upper bound on the $/mu$-norm

A fast algorithm for the computation of the optimally frequencydependent scaled H1-norm of a finite dimensional LTI system is presented. It is well known that this quantity is an upper bound to the "¯-norm"; furthermore, it was recently shown to play a special role in the context of slowly time-varying uncertainty. Numerical experimentation suggests that the algorithm generally converges quadratically