isempty - Determine whether LTI model is empty
Syntax
isempty(sys)
Description
isempty(sys) returns TRUE (logical 1)
if the LTI model sys has no input or no output,
and FALSE (logical 0) otherwise.
Where sys is a FRD model, isempty(sys) returns TRUE when
the frequency vector is empty. Where sys is an
array of LTI models, isempty(sys) returns TRUE when
the array has empty dimensions or when the LTI models in the array
are empty.
Example
Both commands
isempty(tf) % tf by itself returns an empty transfer function
isempty(ss(1,2,[],[]))
return TRUE (logical 1)
while
isempty(ss(1,2,3,4))
returns FALSE (logical 0).
See Also
issiso, size
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