[rrd-users] newbie rrd question - probably a very old issue

Dan Gahlinger dgahling at hotmail.com
Sat Sep 1 21:37:23 CEST 2007

check it out for yourself.
a company everyone hates as the reference

here's a year NASDAQ graph showing highs and lows with points between
and no loss of accuracy

if that doesnt work (for whatever reason) use this:


>From: Tobias Oetiker <tobi at oetiker.ch>
>To: Jason Fesler <jfesler at gigo.com>
>CC: Dan Gahlinger <dgahling at hotmail.com>, rrd-users at lists.oetiker.ch
>Subject: Re: [rrd-users] newbie rrd question - probably a very old issue
>Date: Sat, 1 Sep 2007 20:45:19 +0200 (CEST)
>if you want to have this, you create TWO rras, one with MIN and one
>with MAX consolidation.
>in the graph you draw
>MIN and stack MAX-MIN on top of it and you get that 'magic' graph
>dans seems to be looking for ... it will look odd, since it will
>change its 'width' depending on the distance between min and max,
>but I can't see how he expects this to work any other way ...
>I wonder what his nsdaq graph does if in a single day there is an
>extreem high and and extreem low, but there is only a single pixel
>in the graph to represent that day ...
>Today Jason Fesler wrote:
> > Based on a side conversation with Dan, this is what I'm understanding:
> >
> > RRD will graph exactly one consolidated point in time, if there are more
> > points than pixels on the X axis.  Dan wants *all* value points 
> > not consolidated.  RRD has no option to do that.
> >
> > I'm thinking that *maybe* it can be faked, with some stacked graphs or
> > something, *if* MIN and MAX were also included in the rrd file; do a 
> > between min and max.
> >
> > But it isn't going to happen with a single graph statement, and I'm 
> > problems figuring out how to sanely show min/average/max if desired. :-)
> >
> >
>Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten
>http://it.oetiker.ch tobi at oetiker.ch ++41 62 213 9902

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