William R. Lorenz wrote: >I'm looking to take 2-4 unique RRD files that plot the same data from >different perspectives (i.e. temperature readings from four different >sensors) and average all the data points together into one graph line. > >Is there a CDEF, VDEF, or other such function that will allow me to >average more than one data source together for this rrdgraph purpose?
You can pull data from more than one source - just define multiple data sources with the right files. Averaging four values to one line is basic arithmetic, if the values are a to d, then the average is simply (a+b+c+d)/4, or in rpn "a,b,+,c,+,d,+,4,/", or "a,b,c,d,+,+,+,4,/". If one or more of the sources may be undefined (or null), then the result will be null. Working around this is a bit more involved. -- 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 [email protected] https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
