jspice3 optimization routine: optimize
.control
#
# Main loop for the optimizer
# 
# Many thanks to Clark Hamilton of NIST (Boulder, CO)
# who developed the logic.
#
# External vectors:
#   upper[], lower[], flags[], margbest[], better
#
# External system vectors:
#   value[]
#
# Internal vectors:
#   o_runnum, o_cnt, o_delta
#
# value[] and flags[] are defined in circuit file header
# value[]: current set of center values for circuit
# flags[]: set to 1 for the indices of value[] being optimized

unlet upper lower margbest flags better
let upper[19] = 0
let lower[19] = 0
let margbest[2] = 0
let better = 0
rusage space
source $argv[1]
rusage space
echo optimizing: $argv[1]
margins
rusage space

let o_runnum = 1
while (o_runnum < 2)
    echo optimization pass $&o_runnum
    let o_cnt = 0
    while (o_cnt < 3)
        if (flags[o_cnt] = 0)
            let o_cnt = o_cnt + 1
            continue
        endif
        let o_delta = upper[o_cnt] - lower[o_cnt]
        let o_delta = o_delta / (value[o_cnt] * 5 * o_runnum)
        let value[o_cnt] = value[o_cnt] + o_delta
        margins
        merit
rusage space
echo 1 n=$&o_cnt val=$&value[$&o_cnt] better=$&better
        if (better <> 0)
            while (better <> 0)
                let value[o_cnt] = value[o_cnt] + o_delta
                margins
                merit
rusage space
echo 2 n=$&o_cnt val=$&value[$&o_cnt] better=$&better
            end
            let value[o_cnt] = value[o_cnt] - o_delta
        else
            let value[o_cnt] = value[o_cnt] - 2*o_delta
            margins
            merit
rusage space
echo 3 n=$&o_cnt val=$&value[$&o_cnt] better=$&better
            if (better <> 0)
                while (better <> 0)
                    let value[o_cnt] = value[o_cnt] - o_delta
                    margins
                    merit
rusage space
echo 4 n=$&o_cnt val=$&value[$&o_cnt] better=$&better
                endif
                let value[o_cnt] = value[o_cnt] + o_delta
            else
                let value[o_cnt] = value[o_cnt] + o_delta
            endif
        endif
rusage space
echo done n=$&o_cnt val=$&value[$&o_cnt] up=$&upper[$&o_cnt] \
low=$&lower[$&o_cnt]
        let o_cnt = o_cnt + 1
    end
    let o_runnum = o_runnum + 1
end
                
unlet o_cnt o_runnum o_delta
.endc