Hi, when i do ".save" in ngspice. It's saved only voltages and currents. How could i save variables too? (Ex.: let tc = deriv(v(vts)), i would like to save the tc too)

Would printing them, like in the example below, suffice? https://github.com/imr/ngspice/blob/master/examples/control_structs/new-check-3.sp If not I would suggest basically type casting it into a voltage, so that it naturally gets picked up by the save, with a behavioral voltage source.

@Eric Smith I would like to plot in Gaw the variables wich are in plots command