[rrd-users] Re: Setting upper and lower boundaries on graphs

[Alex van den Bogaerdt]

Nicholas Tang wrote:
> 
> On Tue, 4 Dec 2001, Alex van den Bogaerdt wrote:
> 
> > You've just made the upper-limit rigid.  You also want a rigid
> > lower-limit (set to 0).
> >
> > I think that's all there is to it.
> 
> Hmmm.  That worked... but I thought it wouldn't.
> 
> According to the docs:
> 
> -l|--lower-limit value (default autoconfigure)
> This is not the lower limit of a graph. But rather, this is the maximum
> lower bound of a graph. For example, the value -100 will result in a graph
> that has a lower limit of -100 or less. Use this keyword to expand graphs
> down.

You are defining a window through which you can see the image.  The bottom
of this window is *not* set to zero, it is auto configured.  If all of
your data is above a certain value, there's usually no desire to show the
part of the image that is below this value,  the bottom of your window
is thus set at a value above zero.

With the "--lower-limit" option, you define the *maximum* value for
the bottom of your canvas.  With a lower-limit of 0, the bottom of
the canvas cannot be higher than 0 on the y-axis.

HTH
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