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Crossover frequencies for sector bound

returns the frequencies at which the following matrix
`wc`

= getSectorCrossover(`H`

,`Q`

)*M*(*ω*) is singular:

$$M\left(\omega \right)=H{\left(j\omega \right)}^{H}Q\text{\hspace{0.17em}}H\left(j\omega \right).$$

When a frequency-domain sector plot exists, these frequencies are the frequencies
at which the relative sector index (R-index) for `H`

and
`Q`

equals 1. See About Sector Bounds and Sector Indices for details.