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B = isreal(sys) returns
a logical value of 1 (true)
if the model sys has real-valued coefficients,
and a logical value of 0 (false)
otherwise. If sys is a model array, then B = 1 if
all models in sys have real-valued coefficients.
B = isreal(sys,'elem') checks
each model in the model array sys and returns
a logical array of the same size as sys. The
logical array indicates which models in sys have
real coefficients.
sys — Model or array to check input-output model | model array
Model or array to check, specified as an input-output model
or model array. Input-output models include dynamic system models
such as numeric LTI models and generalized models. Input-output models
also include static models such as tunable parameters or generalized
matrices.
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