Hi, I am graphing barometric pressure, with the graph showing a two day period. I would like use gprint to add the rate of change over the last hour to the graph. I would like to take the value from 1 hour ago and subtract the LAST value. The trouble I am having is getting the value from 1 hour ago. Below is what I am trying to do:
VDEF:last=pressure,LAST GPRINT:last:"Current=%4.2lf%s" \ CDEF:old=pressure,LAST-1h VDEF:ROC=old,LAST,- GPRINT:ROC:"Change=%4.2lf%s" \ But I am unsure how to get the value from 1 hour ago. which is what I was hoping "CDEF:old=pressure,LAST-1h" would accomplish. Thanks in advance for any help, Jeff -- View this message in context: http://www.nabble.com/Calculating-rate-of-change-from-gauge-tp16693297p16693297.html Sent from the RRDTool - User mailing list archive at Nabble.com. _______________________________________________ rrd-users mailing list [email protected] https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
