[rrd-users] Using RPN variables in the RRD graph title label: simple yes or no answer
rlnewman at ucsd.edu
Fri Nov 12 23:47:31 CET 2010
Hi RRD gurus,
In an earlier email to the users group a couple days ago I was asking about CDEF and VDEF variables. Is it possible to take one of these values and use it in the graph's title or GPRINT label?
For example, I use VDEF to create a variable dtfoo:
Is it possible to substitute this value into the graphs title label thus:
rrdtool graph /path/to/outputimage/rrd.png \
--interlaced --imgformat PNG --end 1289434618 --start 1286756217 \
--width 600 --height 200 \
GPRINT:dt:LAST:'Latest value for TESTFOO\: %4.0lf%s\j' \
--title 'Max value for graph is: dtfoo'
Obviously my pseudocode will fail and just output the string 'dtfoo', but can I substitute it in somehow? My users need to know the max value that is being used to calibrate all the other values in the graph.
Alternatively can I concatenate the GPRINT variable substitution? Something like (here I have used a comma as the variable splitter):
GPRINT:dt,dtfoo:LAST:'Latest value for TESTFOO\: %4.0lf%s from a maximum of %4.0lf%s\j'
A simple 'yes, here is the documentation' or 'nope, you are crazy' answer is fine.
Thanks in advance and have a great weekend all!
- Rob Newman
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