I'm sure everyone here has.....but have you all learned the absolute brilliance of the TI-89? It is a beautiful thing....Entering state-space matrices and it returning the appropriate TF, or entering the TF, and it returning a nyquist plot. I wish I had discovered the wonders of this things years ago. But I guess once you learn something well enough to write the code for it, you know the process thorough enough.....but nevertheless....if you're an EE, you may want some of my 89 programs friends and I have written.
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