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In MATLAB (V5.3) SIMULINK how to use the "From Workspace" feature ?

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Hi all,

I tried assigning two vectors 't' and 'u'.
And while simulating, I change the parameters (Workspace I/O). I check the option for "Load from Workspace" Input as [t,u].

After this i try to simulate and it does not seem to work. It gives an error saying :

" External input specified in the simulation parameter dialog box on the Workspace I/O page (or as an option to SIM command) to a model containing no root inport blocks "

How do i get through this ?

Help me out, somebody please try it out and remember it is in MATLAB 5.3, Simulink 3. Its really frustrating !!!
 
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