parameter sweep
* resistive divider, R1 swept from start_r to stop_r
VDD 1 0 DC 1

R1 1 2 1k
R2 2 0 1k

.control
let r_start = 1k
let r_stop = 10k
let r_step = 1k
let r_curr = r_start
* loop
while r_curr <= r_stop  $ alt. -> while r_curr le r_stop
    alter r1 r_curr
    op
    print v(2)
    let r_curr = r_curr + r_step
end
.endc

.end