[rrd-users] Re: multiple yaxis

[Alex van den Bogaerdt]

On Mon, May 30, 2005 at 08:35:41AM +0200, Tom Rogie wrote:
> Hello,
> 
> Im trying to put some data from a weatherstation into a graph. I would 
> want to have the windspeed (in knots) and winddirection (in degrees from 
>   north) in the same graph.
> For example: windspeed from 0-30 knots on the left yaxis and as an area 
> on the graph. the winddirection (0-360) on the right axis as a line on 
> the graph.
> 
> Can I get those multiple yaxis in rrdtool?

You cannot currently get two axes in rrdtool, however you can
make the plot and write a description in the graph.

Suggestion: create a fixed Y-axis 0,9,18,27,36 which describes
both {windspeed in knots} and {wind direction divided by ten}.

If that's not good enough, you'll have to program it yourself
or overlay two images (one transparent).

HTH
Alex

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