James Russo wrote: >I have an RRD file with temperature, cooling setpoint, heating >setpoint, cool flag (are we cooling 1/0) and then heat flag (are we >heating 1/0). ... >It would be nice to just throw a vline when calling for cool or >heat, but I don't think it is possible to capture the "transition" >of the values and determine the time to put the vline at.
Correct, unless your transition happens to be on a step boundary, then you won't see a sharp transition between 0 and 1. Once you get into consolidated data, then it becomes even worse since there may have been several transitions in (say) a 2 hour period. What I think you might do is compare the stored cooling flag with some non-integer number. For example, if you compare against 0.5 then you've get an indication of whether you were cooling more than you weren't. Compare against 0.1 and you'll get an indication that you were doing anything but very little cooling. By the time you consolidate over a longer period, depending on your choice of threshold, you could have both cooling and heating showing as active. You might consider using a range of colours, rather than just 2 or 3. I think your idea is that you'll plot in (say) blue if you've been cooling, red if you've been heating, and green if neither. You could expand that a bit, and use different gradations across the rainbow between red and blue. You'll need to come up with a formula to combine the heating and cooling quotients to get a single value - and this may vary with timescale of graph/consolidation period length. Just "thinking aloud", this may give a starting point ... q=1+heating-cooling If you are heating all the time, then q=2, if you are cooling all the time then q=0, if you are not using heating or cooling or if you heat and cool in equal amount (possible over 24 hours or longer) then q=1. So you might choose to plot in green if 0.9 < q <= 1.1, in 'orangy green' if 1.1 < q <= 1.25, orange if 1.25 < q <= 1.5, and red of q > 1.5 I think some experimentation may be needed. -- Simon Hobson Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed author Gladys Hobson. Novels - poetry - short stories - ideal as Christmas stocking fillers. Some available as e-books. _______________________________________________ rrd-users mailing list rrd-users@lists.oetiker.ch https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
