On 23.02.2013 15:14, Alex van den Bogaerdt wrote: >> I habe a pellet oven with webinterface (austrian ETA). The webinterface >> works perfect. I can read and set most of the values. >> >> Two of the values are counter: >> - pelles in kg >> - working time in seconds >> >> I put the pellets in kg in a counter rrd. So I can see for instance >> pellets/day vs. outside temperature. > > Internally RRDtool will compute and store the number of kilograms per > second. >
Yes right, I multiply with 86400 ... >> Now I am interested in the value of pellets per year. My imagination >> would be a gliding yearly average (every day the rrd will be updatet >> with the pellets of the last 365 days). > > Don't update like this. Just keep updating the RRD as usual. I do this since more than a year. > Then display 365 days in a graph of 365 pixels wide. > > Each pixel column will show the average number of kilograms per second > during that day. right. > > If you print the average of those 365 values in your graph, you have the > average number of kilograms per day measured over an entire year. puh, how can I do this? > > A year is 365 times 24 times 60 times 60 seconds. That is 31536000 seconds. > Just multiply the rate you already have in your RRD by 31536000, and then > compute the average. The outcome will be the number of kilograms during the > past 365 days, which is the sliding window you want. Here I need also a hint or help how I can do this... > > One small problem is that for RRDtool a day starts and ends at midnight UTC, > which is close but not equal to your time. I don't think this should be > relevant, even if you would live at the other side of the globe. not relevant, right. > > The other small problem is that you count kilograms, not pellets. This you > could solve by another multiplication in your CDEF, number of pellets per > kilogram. my fault, I am interested furhtermore in kg of pellets. counting pellets is on the way to counting sand :) thanks and regards > > _______________________________________________ > rrd-users mailing list > rrd-users@lists.oetiker.ch > https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users > _______________________________________________ rrd-users mailing list rrd-users@lists.oetiker.ch https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users