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Hi, anyone know can I to change value of w, w is width of a MOSFET, the dowhile work but the graphics are all same 

i think it is something like `alter @name_of_fet[width] = 2`

Refer to the Ngspice manual on the alter command then

<@U03CSQTGFM2> i also have many times tried to do this, i have tried using alter, altermod, alterparam, no one worked. I think the only way is running multiple simulations , one size at a time.

<@U01QTMG2K8R> the correct way should be:
`alter m.xm2.msky130_fd_pr__nfet_01v8 W='0.4 + run * 0.1'`, assuming `run` is a loop parameter (1, 2, 3....10), `xm2` is the nmos in the schematic.
It does not work:
`Error: no model available for w=  5.0000000e-01 l=  1.5000000e-07.` I have also tried to scale down the alter assignment by 1e-6 :
`alter m.xm2.msky130_fd_pr__nfet_01v8 W='4e-7 + run * 1e-7'`. This also didn't work.
These are the things i tested some time ago, after all the failures i decided this is not possible to do with ngspice.

<@U03CSQTGFM2> may be if you have time try to submit this basic needed functionality to <https://sourceforge.net/p/ngspice/support-requests/|the ngspice developers>, they may probably figure out how to write the dowhile loop to do the task. If you get the work done please let me know! :-)