The short answer is no, you cannot do this in RPN.
The longer answer is that, if you want to do this, you’ll need to do some pre-processing in separate code, and then just use a COMMENT definition to insert the nodename. This is because of two things – 1. RRD variables are numeric only, not text. So you cannot have a variable holding the node name, though you could in theory just hold the NN numerical index. 2. There does not currently exist an RPN function for ‘MAXINDEX’ or similar; IE, give the *index* of the max value in the list rather than the max value itself. This would possibly be a nice enhancement to create though. Steve Steve Shipway [email protected] (GNU Terry Pratchett) From: rrd-users [mailto:[email protected]] On Behalf Of Aaron Thomas Holt Sent: Friday, 26 June 2015 9:05 a.m. To: rrd-users Subject: [rrd-users] RPN for max of list of nodes Hi all, I currently have a legend formatted like a table like the one below: min max average node01 123 123 123 ... nodeNN 123 999 123 I would like a line that displays the maximum for all nodes that looks something like what follows: overall max: 999, node NN min max average node01 123 123 123 ... nodeNN 123 999 123 Looking at the RPN documentation it looks possible to find the max value with a CDEF, but is there a way to find the associated node as well? Thanks, Aaron
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