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Crossover frequencies for specified gain

returns
the vector `wc`

= getGainCrossover(`sys`

,`gain`

)`wc`

of frequencies at which the frequency
response of the dynamic system model, `sys`

, has
principal gain of `gain`

. For SISO systems, the
principal gain is the frequency response. For MIMO models, the principal
gain is the largest singular value of `sys`

.

`getGainCrossover`

computes gain crossover frequencies using
structure-preserving eigensolvers from the SLICOT library. For more information about
the SLICOT library, see http://slicot.org.