Hi @Tim Edwards I try to pass the param value into the val of meas. It show error I also try another way like First i try to assign param to let variable then try to assign let variable into val of measure but it not working Thank you

@Ashutosh Kumar I think this is very ngspice specific. You better direct the question to the ngspice discussions

Sure

@Ashutosh Kumar A suggestion. To help people help and test your example do not post photos, just attach a small test netlist (not the xschem circuit) and the error you get from the simulator.

Sure i will consider it

A good tutorial of the ngspice control language is here. I usually take working examples from there and adapt to my needs. Same thing as i do with bash scripts, i can not write even a simple

if

condition with bash without getting syntax errors or misbehavior.

Thank you @Stefan Schippers this tutorial very much helpful