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observability MATHSCRIPT PROBLEM

hey,
i am facing a problem in the observability mathscript .  following is the command i am using for findong OBSERVABILITY of 4 matrices A,B,C,D which i have already defined.

Ob=obsv(A,C)'
rank(Ob)
RO=rank(Ob)
CO=CTRB(A,B)
rank(CO)
RC=rank(CO)


It cannot identify the 'obsc' and 'CTRB' commands. Please help.

 

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An offshoot of this: http://forums.ni.com/t5/LabVIEW/Matlab-problem-in-Labview/m-p/1484990

 

Those functions are part of the Control Design Toolkit. Do you have this?

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