<br>Perhaps I was unclear. I only want to graph "last time we got data", as this should increase every ten minutes. I want to make a graph that shows when this doesn't increase, and highlight areas where it doesn't increase for a certain threshold of time. This appears possible with rrdtool, to me at least.
<br><br>For example, imagine data like this:<br><br>time | updated<br>------------------------------------------<br>04301210 | 04301140 ( Apr 30 at 12:10PM, the most recent data is 11:40AM)<br><div>
<span class="gmail_quote"></span>04301220 | 04301150 ( Apr 30 at 12:20PM, the most recent data is 11:50AM)<br>04301230 | 04301150 ( ten minutes later, the most recent data is still 11:50AM, unchanged)
<br><br>Could rrdtool handle this?<br><br>Thanks,<br>Grant<br><br><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><br>I would suggest that if all you want is "last time we got data" then
<br>rrdtools are not the best way to do it<br><br><br>If you are plotting something that comes out of the weather stations<br>(for example temperature) and only update an rrd database when you<br>have data, then you will naturally get a gap in the graph.
<br><br>If you did plot time, then you would also find yourself with a gap<br>(whether you plotted 'time' as an increasing number, or 'rate of<br>change of time' as a straight horizontal line).<br><br>In both cases, this is because when you miss data, the rrd will end
<br>up containing NAN (Not A Number) and the graphing will (by default)<br>not draw a line at all.<br><br>_______________________________________________<br>rrd-users mailing list<br><a href="mailto:rrd-users@lists.oetiker.ch">
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