Re: mksh import

[Christopher Berardi <cberardi%natoufa.com@localhost>]

>I ran your script on various systems; very impressive, both for
>performance and portability reasons.  ksh93 is beginning to win my
>heart (although it's not a portable as bash, in this case.)
>
>Below is the summary:

I noticed that several of the shells croaked while trying to execute the 
script. I know that I had some troubles with the 'let' and '{-20..20}' features 
(among a couple others). I've slightly rewritten that script to make it run on 
NetBSD's /bin/sh -- so it should be highly portable (I think). Here is the 
results from running on NetBSD 5.1 with /bin/sh:

==================================
NetBSD: /bin/sh

real         0.87
user         0.40
sys          0.46



inmandelbrot() {
    mag=$(($1 * $1 + $2 * $2))
    if [ $mag -gt "40000" ] || [ $5 -ge $6 ]; then
        echo $5
    else
        r=$((($1 * $1)/100 - ($2 * $2)/100 + $3))
        i=$((($1 * $2)/100 * 2 + $4))
        cnt=$(($5 + 1))
        inmandelbrot r i $3 $4 $cnt $6
    fi
}

for y in `seq -20 20`; do
    for x in `seq -20 20`; do
        rval=$((x * 10))
        ival=$((y * 10))
        val=$(inmandelbrot rval ival rval ival 1 10)
        if [ $val -eq 10 ]; then
            echo -n ".";
        else
            echo -n $val;
        fi
    done
    echo
done



-- 
Christopher Berardi
http://www.natoufa.com/

Be still, and know that I am God (Psalms 46:10)