open-source-silicon.dev

I want to sweep the voltage source `V2` and plot the *output impedance* (`Rout`) of a circuit, where `Rout` is defined as `Vout / Iout`, in an *AC analysis* (not DC). Specifically:
• *X-Axis:* Voltage of the source `V2` (swept over a range).
• *Y-Axis:* Output impedance `Rout = v(out) / i(V2)` calculated during the sweep.
how can i do this in ngspice ?

.dc v2 10m 2 10m
.control
  run
  let rout = deriv(vout)/deriv(i(v2))
  let va = i(v2)/deriv(i(v2))
  plot rout
  plot va
.endc

<@U01QTMG2K8R> thank yo so much you saved me a lot of time