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Unformatted text preview: array. Two sign changes
in the first column Two roots in RHP 9 10 Example 2 Example 3 Routh array Routh array
If 0 appears in the first column of a
nonzero row in Routh array, replace it
with a small positive number. In this
case, Q has some roots in RHP.
Two sign changes
in the first column If zero row appears in Routh array, Q
has roots either on the imaginary axis
or in RHP.
No sign changes
in the first column Two roots
in RHP Take derivative of an auxiliary polynomial
(which is a factor of Q(s))
11 No roots
roots are on
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- Spring '08