This problem of transposing a matrix bigger than you want to consider slurping feels familiar. The techniques used to sort "big" files in the bad old days, disk or tape based sort-merge, might be adaptble. The trick is to do it in 2 (or small * log N) passes,by creating a simpler suitable intermediate form.
Bill --- William Ricker [EMAIL PROTECTED] _______________________________________________ Boston-pm mailing list [EMAIL PROTECTED] http://mail.pm.org/mailman/listinfo/boston-pm

