[rrd-developers] Output Bug: Problems w/ Y-Axis Units

[Casey McGinty]

Well, I realize that this type of "auto" layout is not trivial in the
slightest. If I have a chance I may look into it. My first goal was to
confirm that I wasn't missing some obvious solution in the command-line
options.

The reason I'm using the alt- methods is because I want to get a zoomed in
view of my data. The default methods would generate a scale from 10 to 20,
which for my data basically become a flat line. For my use case, I'm very
interested in seeing if the line is trending up or down. So for example, a
difference of 0.05 +/- on the graph is important to be able to see.

On Wed, Jul 7, 2010 at 8:13 PM, Tobias Oetiker <tobi at oetiker.ch> wrote:

> Hi Casey,
>
> auto scaling is tough ... note that alt-y-grid and alt-autoscale
> are two independent 'fixes'. Used together, they can produce rather
> interesting results ... the two instances of 13 in the graph come
> from the fact that one of the two insist on putting at least two
> labels to the graph .. that they are both '13' is because the
> difference between the two is > 1
>
> I still claim that my original algorithm (the thing you get without
> the --alt* options when you just run rrdtool) is the most robust
> one ... :-) but, by all means, if you see ways to generically
> improve autoscaling, or add another alt-* algorithm, I would be
> most interested in your contributions !
>
> cheers
> tobi
>
> Yesterday Casey McGinty wrote:
>
> > I sent this to the users list, but didn't get any response. The code
> below
> > creates some weirdness on the Y-axis. Can I just force rrdgraph to output
> > unit labels with 1 decimal place. Right now the graph gives me two
> labeled
> > lines, both are "13".
> >
> > ---------- Forwarded message ----------
> > From: Casey McGinty <casey.mcginty at gmail.com>
> > Date: Tue, Jul 6, 2010 at 8:37 PM
> > Subject: Problems w/ Y-Axis Units
> > To: rrd-users at lists.oetiker.ch
> >
> >
> > Hi,
> >
> > Can someone show me how to get a better Y-axis on this graph? It would be
> > nice if it could indicate the first decimal value. I know --rigid will
> > adjust the range enough to fix it, but I like having a little padding on
> the
> > top and bottom. I'm running RRDtool 1.3.8
> >
> > rrdtool create test.rrd \
> >    --step 36000\
> >    --start 1278216000\
> >    DS:test:GAUGE:36000:U:U \
> >    RRA:AVERAGE:0:1:450
> >
> > rrdtool update test.rrd 1278216000:1.2995109312e+01
> > rrdtool update test.rrd 1278252000:1.2386894574e+01
> > rrdtool update test.rrd 1278288000:1.2756351457e+01
> > rrdtool update test.rrd 1278324000:1.2922753446e+01
> > rrdtool update test.rrd 1278360000:1.2355706091e+01
> > rrdtool update test.rrd 1278396000:1.3136786020e+01
> > rrdtool update test.rrd 1278432000:1.2281093692e+01
> > rrdtool update test.rrd 1278468000:1.2874299159e+01
> >
> > rrdtool graph test.png --start 1262304000 --end 1278468000 \
> >         --alt-autoscale \
> >         --alt-y-grid \
> >         --width 450 \
> >         --height 125 \
> >         DEF:test=test.rrd:test:AVERAGE \
> >         LINE1:test#FF0000:test
> >
>
> --
> Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
> http://it.oetiker.ch tobi at oetiker.ch ++41 62 775 9902 / sb: -9900
>
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