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modalstate 293
modalstate
Syntax
outsys = modalstate(sys, {keywords})
Parameter List
Inputs: sys Input Dynamic System
Keywords: increasing Boolean. Order in terms of increasing magnitude (contin-
uous) or angle (discrete). Default = 1
decreasing Boolean. Order in terms of decreasing magnitude (contin-
uous) or angle (discrete). Default = 0
splitstable Boolean. Separate the stable from the unstable modes and
order separately. Default = 0.
Outputs: outsys output Dynamic System
Description
Transform the system to give a block diagonal A matrix, with complex eigenvalues in
2×2 blocks and real eigenvalues in 1×1 blocks. The system must be diagonalizable to
avoid introducing errors. The initial condition is also transformed. The state names are
deleted, however the input and output names, and period (if discrete) are preserved.
Example
sys = randsys(6,1,1,{stable})
rifd(sys)
Poles:
real imaginary frequency damping
(rad/sec) ratio