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After the `end` instruction of the while loop:
`alterparam W = $&amp;start_w`
`reset`
the `reset` instruction is needed to "apply the changes" to the netlist.

Can I directly change the value of w? Or should I do it with an assignment?

Another question, because sometimes I make changes to the netlist, but I have to delete the .raw files to see the changes in simulation, even though sometimes when I use appendwrite I write unset appendwrite or it also happens when not even if want to use appendwrite

what do you mean by 'directly change W'? You mean changing from the ngspice command prompt? on the command prompt you can use the exact commands you are using inside a .control // .endc block.
you `alterparam W=something`, then execute a `reset` and then run a simulation command.

For the raw file to be deleted to see updated simulation, can you prepare a minimal test case? the smallest test that shows the problem? I will try and see whan is going on... :-)