Control System Toolbox Function Reference

isempty

Test if an LTI model is empty

Syntax

boo = isempty(sys)

Description

isempty(sys) returns 1 (true) if the LTI model sys has no input or no output, and 0 (false) otherwise.

Example

Both commands

isempty(tf)   % tf by itself returns an empty transfer function
isempty(ss(1,2,[],[]))

return 1 (true) while

isempty(ss(1,2,3,4))

returns 0 (false).

See Also
issiso      True for SISO systems

size        I/O dimensions and array dimensions of LTI models

isct, isdt

isproper