On Tue, Oct 04, 2005 at 10:20:11AM +0200, [EMAIL PROTECTED] wrote: > > I'm sure a thourough analysis would explain the differences. > > For research, see footer. > > Yes, this is what I have already assumed during my studies. Even if > you use GPRINT, the results are also different depending on image > size. The results differ for me much more than in Grishas example > (for instance 98.1 vs. 96.0).
It is not the image size itself that causes different data. If you have one-hour data available, and ask for 00:00 to 24:00, you get 24 rows of one hour each. If you have one-hour data available, and ask for now-24 to now, you get 26 rows of one hour each unless "now" happens to be on the hour exactly. This is because you ask a different question. > The big problem is: How can I calculate a mathematically correct > average now based on all measurements between start and end time ? > Nobody (if not knowing the details of RRDtool) will trust me, if I > say, that averages (numbers) depend on the size of the image. The > size of the image should IMHO not affect numbers calculated and > printed by GPRINT or PRINT. You do not have a correct result if you do not start with correct assumptions. From what I read here, you don't. -- Alex van den Bogaerdt http://www.vandenbogaerdt.nl/rrdtool/ -- Unsubscribe mailto:[EMAIL PROTECTED] Help mailto:[EMAIL PROTECTED] Archive http://lists.ee.ethz.ch/rrd-users WebAdmin http://lists.ee.ethz.ch/lsg2.cgi
