To confirm that a matrix has full row rank, for hinfsyn command ?

To run the hinfsyn from robust control toolbox one of required conditions is that the matrix [A-iwI B2; C1 D12] should have full column rank for all values of 'w' (frequencies). A, B2, C1, and D12 are the elements of the generalized plant P.

Is there any command/method by which I can obtain confirmation that the above matrix will hold full column rank for all values of w ? Analytically i do know that for w=0 this conditions fails for my plant.

thanks for the help. dipan

Answer 1

[Sean de Wolski]

Perhaps rank()?

doc rank

[dipan]

thanks for your reponse, but 'rank()' works fine when the matrix is has constant terms. With the fourier argument s=iw, I cannot directly use it for all values of 'w'.