[rrd-users] Diurnal average

[Helios Solaris]

Hi,

Is there an easy way to plot a diurnal average?
I.e. the average from all days at 00:00, 00:01, 00:02 etc. so that I
have a plot of an average day?

My only idea is to dump the database and calculate the average for each
minute using a bash script. But it's nasty and extremely slow.
I hope there is a better (rrdtool internal?) way. Any ideas are appreciated.

Thanks