On Mon, Oct 23, 2006 at 02:50:25PM -0700, Rob Newman wrote: > Hi RRD users, > > In one of my RRD graphs I would like to draw lines of maximum and > minimum valid value. I have a gauge variable that varies greatly, and > I want to add a maximum line at +40, and a minimum line at -40. This > way, anyone who looks at the graph can see if the value plotted from > the archive is valid or not. I know I can do this with RRD. From the > documentation (http://oss.oetiker.ch/rrdtool/doc/ > rrdgraph_rpn.en.html) I see that I can define a VDEF expression.
I'm not sure what you are trying to do. Anyway: if you only want lines at +40 and -40, use HRULE. If you want to limit your values, remove spikes, then CDEF should be used. Example can be found in the tutorial. VDEF is used to get a property of the data set, for instance: DEF:mydata=file.rrd:.... VDEF:themaximum=mydata,MAXIMUM This will make "themaximum" available, which you don't want. -- Alex van den Bogaerdt http://www.vandenbogaerdt.nl/rrdtool/ -- Unsubscribe mailto:[EMAIL PROTECTED] Help mailto:[EMAIL PROTECTED] Archive http://lists.ee.ethz.ch/rrd-users WebAdmin http://lists.ee.ethz.ch/lsg2.cgi
