[rrd-users] Print MAX with date
Alex van den Bogaerdt
alex at vandenbogaerdt.nl
Sun Nov 5 06:30:16 CET 2017
> Hi folks,
> I am wondering how to make a graph with the date and time of maximum
> Actually I do it this way:
> 'DEF:a_temperatur_max=/home/pi/wetter.rrd:aussentmp:MAX‘ \
> 'VDEF:a_temp_max=a_temperatur_max,MAXIMUM' \
> 'GPRINT:a_temp_max:max\: %5.2lf °C'
First of all: that GPRINT is not supposed to work.
These should work
this is what you just wrote:
c) GPRINT:<vdef-name>:<cf>:<format> <--- bad example
There's nothing to consolidate, a VDEF contains a single rate. That's why
it should not have a CF. I'm surprised to learn that it works this way
instead of generating an error.
> But would like to print the time of the maximum value also. Any hints?
a_temp_max contains both the consolidated rate (e.g. your MAX) as well as
the time this occurred. Just print it another time, now with %X as
Open https://oss.oetiker.ch/rrdtool/doc/rrdgraph_graph.en.html and find
'%X' on that page, there's all you want to know.
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