Simscape problem

I drew my model in Simcape (low pass filter) and now I want to see the Bode characteristic. I went: Tools/Control Design/Linear Analysis and when I clicked to plot my Bode there was a message I don't have inputs and outputs what I don't know how to declare in my model. Please, can anyone write step by step the solution for my problem.

Answer 1

[Guy Rouleau]

Please go through the "Getting Started" section of the Simulink Control Design documentation:

http://www.mathworks.com/help/toolbox/slcontrol/gs/bsp4old.html

You will see things like "In the Simulink model window, right-click a signal to be the input. Select Linearization Points > Input Point." Same for output.

[Dan Herbison]

This appears to work only if you have Simulink signals in your model?

Can I designate a Simscape "node" as an input or output? Seems you would have to specify if you wanted current through the branch or voltage of the node as the desired quantity to use?