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Again, thanks for all your help. I have studied your notebook, and I think something is wrong with the results. Your table manipulation logic eludes me, but the results don't make sense (for example, if you do a line plot of the spectrum at a single...
Perfect -- thank you so much. I am so happy!![enter image description here][1] [1]: http://community.wolfram.com//c/portal/getImageAttachment?filename=3898parametric_dependence_on_frequency.jpg&userId=791045
Wonderful. This is now doing what I need. I may have to get a new Mathematica manual -- the 4.0 manual doesn't have NDSolveValue ! Thanks for taking the time to answer a pretty lame question.