Geoffrey_Coram
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As Ken says, copying the value to a variable is the most likely solution. My impression is that internal nodes, even electrical ones, are not available for plotting in most simulators. A number of simulators support the attributes in VAMS LRM 2.2 for declaring "operating point values" (some will give you all the variables when you "save all" but only give you the op-pt variables if you've declared at least one). The way to do this is to use the "desc" and/or "units" attributes:
(* desc="position", units="m" *) real z_pos;
Do this outside the analog block, eg right after real A, b, C, C ...
Then, inside the analog block, z_pos = Pos(z);
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